I have to go back to read the rest of the entry - but strongly disagree that waiting until marriage is a certain way to guarantee divorce. I’ve only had my husband as a sexual partner and it’s amazing - and we’ve been married/together for 25 years.
Sounds like your pendulum is swinging from super conservative views on marriage and sex to super duper liberal sexual practices (I guess from feeling suddenly “free”)...like a rebound. Hope for your sake that you settle somewhere in the middle eventually - happy, sexually actively, committed to someone who is also committed to you.