Disgusted

So my husband recently told me about 2 of his ex-friends. Both of them are buddies from college were buddies. Well both of these buddies are married one has 3 small kids the other has no kids. Well recently my husband told me why they cut off my husband for which I definitely don't mind but I'm shocked in their habit. My husband told me how one night when the 3 of them were hanging out at night the 2 guys went to some night club and had sex with a prostitute! My husband said he was disgusted by it when a prostitute asked him for service and he left. I trust my husband 101% but the thought of the other 2 guys doing this without their wives knowing and they have families just disgusts me. They cut my husband off after since he didn't participate and now knows their secret. I feel sorry for their wives who have no clue probably. Why do guys do this and get married ?