At this point, it is just really hard to say. I do think that there were conflcits in the marriage that were sexual in nature.
* Why would a woman have sex and get pregnant 2 weeks after having a miscarriage and theraputic abortion?
* What is it that jay was telling his female co-workers that his wife wouldn't let him do (sexually)?
* why was a therapist who specializes in transgender and cross-dressing be selected by michelle?
* why did jason have condoms?
* did michelle know about his philandering? (i think that she did but only discovered that he was sleeping with MM the night of the murder)
It could be that michelle was dressed but had her pants and panties were pulled down. If a rape occured, it was marital rape. jason is the killer.
it is also possible that a rape didn't occur, because michelle fought back
and she lost her life because of it. i don't think it was the sole reason jason returned to Birchleaf that night, but it could have been one of many things that happened that night.
He was an angry, distant, surly spouse who felt trapped in his marriage. he married michelle because she was pregnant. he treated michelle disrespectfully from the beginning ("We're getting married! Michelle is pregnant!" and how he only came down for a few minutes in gym shorts to his own wedding shower). it is heartbreaking.