Why do i feel bloated after sex?

Bloating: One of the chemicals associated with sex called prostaglandin is also associated with bowel activity. If you had something like IBS you could have some post coital bloating. Some women with endometriosis sometimes complain of bloating and gas like cramping. Infection would be a possible but less likely issue. Try some gas x or simethicone before having sex (maybe 30-60min before)