Hi,I want to ask about my girlfriend. Before having sex her mensus was normal and very painful. After we started sex her mensus was normal and was no pain. After six months when I left her for sometime next mensus onwards pain started again. Pain was there till third month mensus after I left her. But now she says for forth month mensus pain is not there but mensus is as usual. Somebody said me for her now mensus without pain is possible only if there was a sexual intercourse. Is that correct please advice me

No of course not, silliest thing I ever heard, who told you that, tell them they are just stupid.

Some months there can be lots of pain, other months no pain, there is not connection to having sex

No, sex has no bearing on pain during her cycle. The only time sex and a woman's cycle intermix, is when a woman becomes pregnant because of sex, and misses her cycle.