Early 70s for us, we were single and experimenting sexually, most girls took the pill which had just been released to single women (when it first came out it was for married ones only, believe it or not), AIDS didn't exist, it was the era of "Swinging London" and sexual liberation. Tights hadn't caught on so most women wore stockings, and some copied Mary Quant and shaved their bushes into hearts (nobody shaved them all off). Porn mags did't have open-crotch shots or fucking, so men all got fixated on sexy undies, although there were imports from abroad like "Suck" edited by a young Germaine Greer ("the only newspaper you can fuck" was the strapline, as the back page always had a life-sized pussy photo with "cut here" written across the vagina). Somebody was actually sent to prison for smuggling copies in from Holland.
We both have happy memories of drunken and smoky parties leading to crowded beds, our first threesomes and foursomes, casual sex at festivals, all mostly bareback; obviously not encouraged these days for safety but quite usual them. Rose had her first FF sex experience too. Glad we were there!