Number One Band for me was The Who, but before I found The Who, there was Elton John and Queen.
After The Who, I started to move in a variety of directions and found myself listening to Pink Floyd, Neil Young (and the whole CSNY crew), Frank Zappa, The Clash, The Cars, The Ramones... All kinds of different things. Talking Heads.
A little bit of everything.
Regarding the whole disco / promiscuity thing... The punk scene was just as bad, so I don't attribute this notion of promiscuity to one genre of music. As far as explicit lyrics go, give a good listen to Frank Zappa's Thingfish. Lots of Zappa lyrics are extremely graphic (it was one of the key things that drew me to his music). Frank's music, though, was satirizing that whole self-indulgent era, not celebrating it.
Further, while the punk and disco scenes both had pockets of extreme promiscuity, they were relatively limited. There weren't too many discotheques in central Michigan that saw anything like Studio 54 or CBGBs. I suspect that much the same can be said for just about anywhere else in the midwest that wasn't close to an urban center.
I suspect Ducati's assertion that the drugs, particularly cocaine, were behind the lowered inhibitions that resulted from drug use is more of the root cause of the promiscuity than the music was. Part of this, too, was the extension of the sexual revolution spawned (pun intended) by the availability of The Pill. It's like the door was opened on this whole stored up box of pent up libidinous urges, and, like a jack-in-the-box, when the lid of that box opened, look out....
Part of it, too, I suspect, is that Americans still aren't all that comfortable talking about sex. Oh, we may obsess about it, but there's too much of that puritanical streak in our cultural heritage for us to be really comfortable with the concept that sex between consenting adults is actually a good thing.
From my POV, it was just a perfect storm of the sexual revolution picking up steam and hitting a critical mass, mass quantities of cocaine, and new musical formats that encouraged people to let their ids run the show for a while.