How do I get my girlfriend to dye her hair neon pink?

My girlfriend is pretty conservative, but she has a wild side. She's a sophomore in university right now, and I would love it if she would try a crazy hair color like this. She's only half warmed up to the idea.

you don't.
If she does have a wild side, let her express it in her own way, at her own time. If she feels forced into dying her hair pink and feels ridiculous/gets laughed at, then she will blame and hate you for it.
If you like pink hair so much, then maybe you can dye your own hair this color, or you can both dye your hair.

Sauvage Neon Pink Strapless Bikini Top Medium 3635L $19.99 Time Remaining: 3h 45m Buy It Now for only: $19.99

Size M L 2 pc Swim Suit Neon Pink Green Yellow OP Bikini EUC Peace Sign $6.00 (5 Bids) Time Remaining: 5h 59m

WOMENS 2 PIECE SIZE 6 CATALINA SWIM SUIT BRIGHT NEON PINK W HIGHLIGHTED STRIPES $5.99 Time Remaining: 6h 31m Buy It Now for only: $6.99

LOCAL MOTION 43 WOMEN LARGE 12 14 SWIMSUIT BIKINI BOTTOM NEON SPLASH PINK 3428 $17.99 Time Remaining: 6h 57m Buy It Now for only: $17.99

NWT LARGE NEON PINK BRAZILIAN TIE SIDE BIKINI SWIMSUIT SWIMWEAR MADE IN THE USA $17.99 Time Remaining: 8h 52m Buy It Now for only: $17.99

NWT XL NEON PINK BRAZILIAN TIE SIDE BIKINI SWIMSUIT SWIMWEAR MADE IN THE USA 102 $17.99 Time Remaining: 9h 24m Buy It Now for only: $17.99

Womens SMALL ARIZONA bikini TOP pink white check SMALL NWT rio btm neon green $14.99 Time Remaining: 10h 1m Buy It Now for only: $14.99

ROXY NEON PINK BIKINI SWIM SUIT SIZE MEDIUM $44.99 Time Remaining: 11h 23m Buy It Now for only: $49.99

womens 1 PIECE SWIMSUIT plus size 20w 20 SIRENA neon pink purple green buttons $28.95 Time Remaining: 11h 45m Buy It Now for only: $28.95

sz S Neon Pink and Green floral lined Bikini Bottom only LKNU $7.99 Time Remaining: 14h 42m Buy It Now for only: $9.99

NEW Victorias Secret Sexy Neon Pink Lace Overlay Convertible Halter Bandeau L $17.99 Time Remaining: 18h 49m

Victorias Secret Sequin Embellished Triangle Pink Neon Watermelon Bikini Top $19.99 Time Remaining: 23h 17m

Ujena Womens Swimsuit 2pc Tankini Pink Neon Hot Zebra Tankini Top Boy Shorts $102.99 Time Remaining: 1d 1h 33m Buy It Now for only: $102.99

MOSCHINO MARE neon tank top boy shorts tankini swim suit pink green logo disco $60.00 Time Remaining: 1d 2h 24m

ALL RUFFLES STRIPPER TRI TOP $20.00 Time Remaining: 1d 4h 45m Buy It Now for only: $20.00

Many2Choose New VENUS Bikini Top B C D Purple Green Pink Floral Metallic Neon $6.00 Time Remaining: 1d 5h 31m Buy It Now for only: $6.00

Sinful by Affliction NEON Womens Swimwear Bikini SM402 NEW PINK $89.00 Time Remaining: 1d 7h 30m Buy It Now for only: $89.00

Neon Hot Pink L Large String Bikini Bottom Swimsuit Swim Lined NWT $7.50 Time Remaining: 1d 8h 11m Buy It Now for only: $13.50

Neon Pink Tiny Tri Top w Elastic Straps New OS $6.00 Time Remaining: 1d 9h 2m Buy It Now for only: $8.50

BIKINI TUBE HALTER or STRING NEON FLUORESCENT GREEN PINK ORANGE YELLOW SEXY $15.79 Time Remaining: 1d 9h 42m Buy It Now for only: $15.79

Small Victoria Secret Swimsuit Bombshell Miraculous Pinks Neon Bikini Bottom S $19.99 Time Remaining: 1d 10h 17m Buy It Now for only: $19.99

NWT HM NEON PINK Padded Underwire Convertible Halter Bikini Top Size 34 AB Cups $16.95 Time Remaining: 1d 13h 3m Buy It Now for only: $16.95

NWT HM NEON PINK Thick Waistbank Bikini Bottom US 6 12 $13.95 Time Remaining: 1d 13h 15m Buy It Now for only: $13.95

VICTORIAS SECRET NEON PINK DAISY HALTER SWIM TOP SIDE TIE BOTTOMS BIKINI L NWOT $39.99 Time Remaining: 1d 13h 23m Buy It Now for only: $45.99

NWT Attached Pink Bikini with Neon Orange Lining $49.99 Time Remaining: 1d 14h 18m

NEW HOT ROXY HALTER 2 PIECE SET BIKINI SWIMSUIT NEON BLACK YELLOW PINK GREEN M $44.99 Time Remaining: 1d 15h 13m Buy It Now for only: $44.99

NWT Neon HOT PINK POLKA DOT Bikini Skirt 3piece Set S $32.99 Time Remaining: 1d 16h 40m Buy It Now for only: $32.99

NWT Neon HOT PINK POLKA DOT Bikini Skirt 3piece Set M $32.99 Time Remaining: 1d 16h 46m Buy It Now for only: $32.99

NWT Neon HOT PINK POLKA DOT Bikini Skirt 3piece Set L $32.99 Time Remaining: 1d 16h 47m Buy It Now for only: $32.99

EXPRESS Juniors NEON OMBRE String Bikini Top Bottom Pink Orange XS S NWT FS $29.99 Time Remaining: 1d 18h 20m Buy It Now for only: $39.99

EXPRESS Juniors NEON OMBRE String Bikini Top Bottom Pink Orange Small S NWT FS $29.99 Time Remaining: 1d 18h 21m Buy It Now for only: $39.99

BODY ZONE Sexy Fantasy Low Cut Sport Top One Size Fits All NEON PINK NWT $9.99 Time Remaining: 2d 46m

VICTORIA SECRET BIKINI TIE SIDE NEON HOT PINK ZEBRA BLACK SWIMSUIT M NEW $35.99 Time Remaining: 2d 3h 38m Buy It Now for only: $39.99

New Leg Avenue Skinny dip neon pink hearts monokini bikini pink M L $5.99 Time Remaining: 2d 4h 21m

VICTORIAS SECRET Bikini Pink NEON Beach Sexy Sequinned String MED NIP FREE GIFS $59.99 Time Remaining: 2d 6h 3m Buy It Now for only: $59.99

New Victorias Secret hot neon colored bikini sz S small bright pink yellow $29.99 Time Remaining: 2d 6h 22m

Vintage 80s NEON Trim BLACK Zipper SWIMSUIT Waffle Knit PINK Green Bright 10 M $9.99 Time Remaining: 2d 7h 41m

SEXY NEON PINK ORANGE FLORAL 1 PIECE BATHING SUIT SIZE L + GIFT $25.00 Time Remaining: 2d 9h 36m Buy It Now for only: $35.00

SEXY SHORT SHEER NEON DAY GLO HOT PINK SEE THROUGH SARONG BIKINI COVER UP NEW $5.95 Time Remaining: 2d 10h 23m

Neon Hot Pink Pucker Back Bottom Ruched Scrunch Scrunchie Bikini Spring Break $39.99 Time Remaining: 2d 11h 35m Buy It Now for only: $39.99

Hurley Womens Phantom 9 Boardshort $26.49 Time Remaining: 2d 12h 24m Buy It Now for only: $26.49

99 Degrees Halter Bikini Top Black Neon Green Pink Sz XS $1.99 Time Remaining: 2d 13h 12m Buy It Now for only: $15.00

99 Degrees Halter Bikini Top Black Neon Green Pink Sz M $1.99 Time Remaining: 2d 13h 13m Buy It Now for only: $15.00

NEW Sz S Victorias Secret BEACH SEXY Neon Pink Ruffle Cut out Monokini $34.95 Time Remaining: 2d 15h 8m Buy It Now for only: $34.95

SPLIT SWIMSUIT BIKINI ZIPPER NEON BRIGHT PINK NWT 92 S $32.99 Time Remaining: 2d 15h 46m Buy It Now for only: $32.99

Vintage 80s Neon Pink Leotard with Cutouts unused $0.99 Time Remaining: 2d 18h 28m

ROXY 38 WOMEN MED 8 10 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 4206 $17.99 Time Remaining: 2d 22h 41m Buy It Now for only: $17.99

ROXY 38 WOMENS LARGE L 12 14 SWIMSUIT BIKINI BOTTOM NEON PINK BLUE PURPLE 4207 $17.99 Time Remaining: 2d 22h 47m Buy It Now for only: $17.99

ROXY 38 WOMEN SM 4 6 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 4208 $17.99 Time Remaining: 2d 22h 55m Buy It Now for only: $17.99

ROXY 38 WOMEN MED 8 10 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 4209 $12.59 Time Remaining: 2d 23h 1m Buy It Now for only: $12.59

ROXY 38 WOMEN LARGE L 12 14 SWIMSUIT BIKINI BOTTOM NEON PINK BLUE PURPLE 4210 $12.59 Time Remaining: 2d 23h 3m Buy It Now for only: $12.59

ROXY 36 WOMENS LARGE L 12 14 SWIMSUIT BIKINI BOTTOM NEON CHECK AQUA PINK 4212 $12.59 Time Remaining: 2d 23h 32m Buy It Now for only: $12.59

OCEAN PACIFIC Hot Pink Neon Green Bright Blue Bikini Bottoms Size L 11 13 $10.99 Time Remaining: 3d 1h 28m

Strapless Printed Bandeau Top Ruched Low Rise Brazilian Bikini Summer Swimwear $36.99 Time Remaining: 3d 5h 15m Buy It Now for only: $36.99

NEON PINK VIOLET 2 PIECE BIKINI SWIMSUIT FROM LUTTGARDY IN SIZE MEDIUM $10.00 Time Remaining: 3d 5h 34m Buy It Now for only: $10.00

Neon Pink Ruffled Bikini Remix Collection S NEW + Tags $39.51 Time Remaining: 3d 7h 45m Buy It Now for only: $39.51

New White Pink Neon Bikini Club Dance Lace Bow Cinched Butt Enhancing Bottom M $25.00 Time Remaining: 3d 8h 12m Buy It Now for only: $45.00

NEW VICTORIAS SECRET BEACH SEXY NEON LACE TRIANGLE TOP PINK BIKINI SMALL $29.99 Time Remaining: 3d 8h 25m Buy It Now for only: $34.99

NWT 2pc XS NEON PINK BRAZILIAN BIKINI BEACHWEAR SWIMWEAR MADE USA788 $17.99 Time Remaining: 3d 8h 34m Buy It Now for only: $17.99

Custom Bikini Top CAN BE WORN MORE THAN ONE WAY XS 3X Black White Zebra $29.99 Time Remaining: 3d 9h 33m Buy It Now for only: $29.99

Bikini Bottoms Choose Rear Scrunch XS XL Black White Zebra thong Mod Cheeky $29.99 Time Remaining: 3d 9h 47m Buy It Now for only: $29.99

NWT 2pc SMALL NEON PINK BRAZILIAN BIKINI BEACHWEAR SWIMWEAR MADE USA787 $17.99 Time Remaining: 3d 9h 47m Buy It Now for only: $17.99

NWT Blink neon pink tie dye cover up short ONE SIZE FITS ALL $8.99 Time Remaining: 3d 9h 52m Buy It Now for only: $8.99

ROXY 38 WOMEN SM 4 6 SUPER LOW BIKINI SWIMSUIT BOTTOM GREEN BLUE PINK NEON 2743 $17.99 Time Remaining: 3d 10h 26m Buy It Now for only: $17.99

Custom Bikini Top CAN BE WORN MORE THAN ONE WAY XS 3X Multi Neon Colors $29.99 Time Remaining: 3d 10h 30m Buy It Now for only: $29.99

ROXY 38 WOMEN SM 4 6 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLACK WHITE 4221 $17.99 Time Remaining: 3d 10h 34m Buy It Now for only: $17.99

ROXY 38 WOMEN MED M 8 10 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLACK 4222 $17.99 Time Remaining: 3d 10h 36m Buy It Now for only: $17.99

Bikini Bottoms Choose Rear Scrunch XS XL Multi Neon Fabric thong Mod Cheeky $29.99 Time Remaining: 3d 10h 37m Buy It Now for only: $29.99

ROXY 38 WOMEN SM SMALL 4 6 SWIMSUIT BIKINI BOTTOM NEON PINK BLUE BLACK 4223 $17.99 Time Remaining: 3d 10h 39m Buy It Now for only: $17.99

NWT ROXY L No Worries Neon Pink Green Blue Splatter 70s Halter Bikini Swimsuit $32.97 Time Remaining: 3d 12h Buy It Now for only: $32.97

ROXY 36 WOMEN SM 4 6 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 3672 $17.99 Time Remaining: 3d 12h 50m Buy It Now for only: $17.99

ROXY 38 WOMEN SM 4 6 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 3673 $17.99 Time Remaining: 3d 12h 51m Buy It Now for only: $17.99

ROXY 38 WOMEN MED 8 10 SWIMSUIT BIKINI BOTTOM NEON PINK YELLOW BLUE PURPLE 3674 $17.99 Time Remaining: 3d 12h 53m Buy It Now for only: $17.99

SEXY VENUS 2PC EXOTICNEON METALLICFUSHIA ICED WETLOOK HOT PINKNARROW HI S M $18.99 Time Remaining: 3d 14h 53m

Womens Old Navy XXL Swim Board Shorts Gray Pink Neon $0.99 (1 Bid) Time Remaining: 3d 14h 59m

Candies Womens M Bikini Bottom NWT Neon Pink and White Stripes w Adjustable Tie $7.50 Time Remaining: 3d 23h 26m Buy It Now for only: $7.50