Are you using a spermicide or condoms with a spermicide? They can cause vaginal irritation and burning. Are you douching? This, too, can cause some irritation.

the same thing happens to me, it's because his sperm gets in all the little micro-tears that naturally occur from sex. over time the burning has become less and less, but it's still usually there. but i remember the first time he came in me it burned really bad. depending on how many times and how often he comes in you, it may get better. but if it doesn't you may be allergic to his semen.

it usually burns the worst after i get off my period and we haven't had sex for how ever long my period lasts. but it only happens once in a while.. but i actually think i might have a uti.. because i just got off antibiotics for streap throat and i usually always get a yeast infection. but this time it doesnt burn when i urinate.. the vaiginal walls just hurt, burn, itch, i have to pee a lot but when i do it's actually not a lot of urine that comes out. I'm also extremely tired all the time and those are all symptoms of a uti so i'm going to go to my family doctor and tell him what's going on.. doctors know what to test for and treat for as long as u tell them everything that's going on even when its embarrassing..