I don't know if it's from soap, shaving or vigorous washing down there but my vaginia lips itches, painful during intercourse, burns when I pee, skin peels off and it dry like I have no idea what it is and I know it's not a std because I haven't been with anyone but one person and that person has been faithful to me.
It could be all of the above(minus an std)! But it could also be some sort of urinary tract, yeast, or vaginal infection. Both of which are unrelated to std's but can possibly stem from sex. Your best bet would be to go to a gynaecologist to see what's going on down there because it's a hard guessing game to play! Best of Luck!
I can tell you that some soaps and shampoos will irritate the heck out of my penis, under the foreskin really bad.