Is it possible that if I have a urinary infection, can I pass it to my sex partner?
Yes. Sexually transmitted diseases which affect women badly don't always have any kind of serious effect on men so they can go unnoticed. A very good example is Chlamydia which causes next to no symptoms in the man other than some irritation on passing water and possibly a discharge from the penis. For women it is a totally different story even causing infertility and pelvis inflammatory disease.