Whay actually was it that changed the stuffy moral attitude of the 50-60's, to the slutty moral acceptances of today ?

I thought the 60s and 70s were exponentially more permissive than today. We had what was close to "free love" for a while. This is in extreme contrast to today's tight@$$ed girls that only see men as ATMs.

The Sexual Revolution.

Garage Band, music styles that devolved into jeans and t-shirts
And that Grunge music (screaming, gutter words)

The period when anybody who could afford an AMP was considered a "band" or "group". When melody lost to SCREAMIN'.

the hippies and free love , the birth control pill.

clothing became more revealing

The hippies in the ‘70’s changed most of it, free love, drugs, parties and orgies was their thing. Everyone tamed down in the 80’s because of Aids, but safe sex was still happening except tons of condoms were given out everywhere. 90’s and today are pretty much the same as always, but it really depends on who you’re dealing with, where you live and what ethics the person follows. Obviously, you came across someone undesirable. Hope that helps? Good luck and ignore it because you can’t control anyone but yourself.

Starfish. Don't underestimate those little bastards

Disintegration of family units, caused by women (mothers) wanting/needing to have jobs outside the home, resulting in poor moral training for children. Furthermore, changing attitudes and laws regarding punishment of children has further eroded morality.