I'm sorry! I really couldn't think of any nice way to ask the question!
And the kind of things that the unfortunate subject suggests, well, honestly, they're not unrelated.
Right now, if I lie back, I can bring my legs to a little less than a 90° angle, which doesn't leave all that much room for, well, ahem. Whereas in my (limited) experience, (some? many? most?) women can comfortably have their thighs at something like 130°-140° (look, I never had a protractor, okay?), and even more with knees higher (that is, towards the head).
Obviously, male hips are a different shape to female ones. I was hoping to find out whether it is possible to acquire a degree of that flexibility. I wouldn't expect to match it.
I was once reasonably flexible, though more recent lack of exercise has diminished that (and I am sure a few more years of age hasn't helped), but I'm willing to get back to it. In fact, it's another reason to keep at the exercise.
Unlike 'simply' (ha) learning to do the splits, you don't get an assist from your own weight against the floor. And I'd want to be relaxed and comfortable, not straining to hold a stretch.
And if it's not possible, or to not much of a degree, I guess I should be learning about alternate, er, practices, but that's a subject for another board.