I wholehearted agree with your views and it only says you are a woman not naïve, nor prudish or old fashioned. The worst animal on the planet called Men can only carry out the wild suggestions from your flamboyant friend, and the thinking she has of having sex only for fun. And not all men can carry this for too long. Well I think not any man can carry it for life. Infact, I think your flamboyant friend is naïve, as she cannot foresight that she will be left picking the pieces and will feel totally used and wasted exactly like your other friend but in her case after few years. A man might walk away after having enough fun in a similar fashion as the married man (in your other friends case) did. And the simple reason is we both man are woman are different. So all you woman please stop fighting for equality bcos were different, are different and will be different. A simple explanation with a muscial note would be the verses from the song of movie Ram teri ganga meli stating Nadi aur nari ke ek hi kahani hai...
As the water/river takes the shape of jar in which it is. Woman usually get moulded or accustomed very easily into whatever the circumstances