Outmoded and untrue
Finally I would mention that I would expect all of the aforegoing to also apply in a situation where the roles were inverted and the man were making the greater effort and the woman were the one taking the free ride, so to speak. The scenario of a woman exerting herself for an unappreciative man might be more obvious than that of a man exerting himself for an unappreciative woman, but I am not sure that either scenario is more common.
Well, not everywhere obviously, but certainly when I was young, and I am almost the same age as Pat, girls of my age were getting rid of their virginity fairly young, and not all of us spent all our time looking for meaningful relationships, some of us indulged in a fair amount of rather random sexual behaviour.
As for the risk of becoming pregnant, well I and most of the girls I knew were on the pill, which virtually eliminated the risk of pregnancy, and of course the decline in the stigma attached to unmarried motherhood, plus legalised abortion, meant that even if you did become pregnant the consequences need not be as devestating as in the past.
Unmarried motherhood is tough, but women who have to raise children on their own mostly manage all right in my experience. My seven-year-old son's best friend is the youngest of three children, all of them have different fathers, none of the fathers is around, but their mother manages, she ekes out her child benefit etc by doing cleaning and childminding. It's not an ideal life, but it's not a disaster either.
I've never considered sexual promiscuity to be either shameful or degrading, when you're young and sexual adventures seem exciting, it's perfectly natural to want to experiment, and if you are beseiged by offers of sex from attractive men, you have to be much more strong-minded than I was to refuse them, 'gather ye rosebuds while ye may' you know? A meaningful relationship is more satisfying in the long run, but while you're waiting for the meaningful relationship to come along you've got to while the time away somehow.