The other night(4 days ago) I went to A girls house and we started making out one thing led to another and I started fingering her vagina and Anus and she she started giving me a hand job(mutual masturbation) well I touched my gentails during this act alot and Im afraid Ive caught something..Ive had a burning sensation in my crotch for a couple days now..no discharge or anything like that..Could this be an STI or maybe just Irratation..I tried to be as safe as I could be.