Regarding straight white heterosexual marriages

@sonhouse said
That you remember that is.

What ever did happen to the so-called "missionary position" anyway?

That's just as much hands and knees on the ground (or bed) as doing it doggy-style.

However, the digressive topic-drift started by you-know-who might be indicative of an attempt at diversion, when the OP was asking about the proprietary nature of some marriages (or something like that).

@Mott-The-Hoople said
Dont have sex on my all fours

I honestly can't remember a time when I did, either.

What was your point?

If you are trying to ask for advice just in case (and really with whomever), use your imagination, coordinate with your partner, and try different positions out. Express the potentials of your incarnation -- don't just laze about like some entitled transitory bozo.