No, go to Reddit or Tumblr. You can post there, but you can't post any on Fanpop nor link to any pictures like that. If you post them here, they'll just get reported.
Though, you might be able to post naked pictures as long as it covers breasts and the private parts.

No graphic images like bare breasts, genitalia area of both men and women can not be posted. It's strictly by law of Fanpop site. There were many trolls on here that were posting inappropriate pics of women masturbating in nude and porn-like pics were also posted here and they were reported. The banner also says NOT to post any inappropriate pics on here as well. So please do not post any nudity images of women showing breasts, private areas and men showing their manhood. Thank you.

Quoted from the banner;
''This is NOT a place for you to post pornography, graphic content, or comments or seek sexual partners. ''

But, I think boytoy_84 explained it pretty well for you.