When, we do the sex unhygeinically or the partner might be suffering from any STD(Sexually transmitted disease) . One may get the infection and swelling of the sexual part . On subsequent intercourse , one may experince painful intercorse.
So, 1st thing is that one should avoid contact and the part neet & clean . One should also consult gynaecologist to diagonose the problem and proper treatment.
Tighter, good, he must have enjoyed more then. But the problem with you is that you should report this burning issue with the gynec, the medicines could also have such effects. My sister in law had similar problems.