is sex easy to get?

and why do guys always go have sex w other ppl when their relationship is falling apart? my husband says that its really easy to get sex. he had sex w other ppl when we separated and when he and his exs were taking breaks. plus, when hes single, and was in the army. he claims he can get any woman to have sex w him. i believe its easy to get sex for women, but for guys, i thought it would be hard? unless they hire a prostitute of course. but i mean like having casual sex w women that arent prostitutes. would u be willing to have sex w strangers like that? i cant believe it at all... i understand if its bf, but strangers..., really?