In my case, it's the voyeurism aspect. Being Swingers and a Stag/Vixen couple, my wife knows her role will include having sex with other men. Some my be complete strangers. Of course she and I vet the guy and she ultimately selects the male that will fuck her. (That's also part of the allure-SHE is the one saying yes to a different cock) But it's me watching her submit to some random dick. She generally starts off sucking his cock but always ends up letting the guy penetrate her pussy. And since she insists on bareback, I know he'll be cumming in her or on her. Watching him jerk a squirt on her belly then shove his dick in her pussy and finish unloading, is also a mental thrill.








