Interesting question. I can't imagine many do it seriously against their will. My Filipina wife was a part time ...... for 10 years before we met. Amongst the dross she found enough nice guys who gave her good sex to get her hooked on variety. When we got married she became a faithful Pinay wife. But eventually, as I am 20 years older, I offered her to spread her wings again and she has done, and increasingly I enjoy playing cuckold, to my surprise. But I am sure if I requested she stop she would. She definitely enjoys her varied sex life, it's not against her will, but it's at my request. Make sense?