I think a lot of us punt because we dont get the sex we crave at home, and nothing like the freqency. In my case that's the main reason. Plus I can pay to have a young, pretty fuckbunny for usually the same price as a 40-something with stretchmarks and everything else heading south. Cruel maybe, buy I am a paying customer.
Quite often sex only happens when the OH wants it to happen, which for Mrs T is very rare. In her young days, she'd swallow, but I am not allowed to even CIM now, which with the right WG is satisfying. If fact getting a BJ from Mrs T is as frequent as a lunar eclipse in this country. Neither does Mrs T like to wear nice lingerie before a session, whereas WGs tend to, as I like to unwrap the package as part of the foreplay.
Give us what we want and there's no need to stray.