I'm very worried and nervous my boyfriend of seven months now came on my ass and i got most of it off but there was still a little bit on my butt and I could feel the residue still there as I put my underwear back on... I'm not having sex and I'm still a virgin.. But I am worried the sperm could have traveled.. (also side note he's never came near or on my vagina just on my butt and underwear..)