Does going to the toilet after sex have any effect

This can be caused by excessive friction, and it's usually fine. Do you have a photo?

On the one hand, it may be on fire, and on the other hand, the genitals are not cleaned enough and inflammation appears. >>>More

According to the situation you described, it may be caused by inflammation of the vagina, which will lead to more discharge, itching, odor, inflammation will cause the mucosa to be easily bruised, painful or bleeding during intercourse, it is recommended to go to a public regular hospital for examination and symptomatic treatment. >>>More

Is it that sexual intercourse is too frequent.

Forehead ......Sometimes it's normal to have pain after sexual intercourse. >>>More

It must have nothing to do with sex, I just have been in love a lot, and I've had some girls out to have sex, and that's never a problem.