That is a good point because couples almost always lose their sexual desires sooner or later with age if they don't die first for obvious reasons.
I can see that happening with the men more than the wimmin.
Wimmin bond together closely without sex much more naturally than men do. This is true with hetros too.
That reminds me now of a related point I haven't thought of for a while that National Review did a great article on it very long ago:
Men and Women are always very different (gender) emotionally psychologically and physically even with men gays and wimmin gays but in the debate in ‘civil rights for gays’ versus classic immorality/morality this points has been lost.
Unfortunately when Republicans allow the terms of the debate to be framed in that way they always eventually lose.
The point is that Gay men are far more self destructive than gay wimmin are for reasons that should be obvious. This fact has been completely left out of the current debate especially when presented to young adults who will not accept 'Its wrong just because it is'
Gay men are more promiscuous and thus disease ridden and more given to drug use (meth).
But I hear some lesbians have very violent relationships.