He cheated on first two wives and that's why they left him. Sure maybe he didn't have sex with them because he had it with other women or maybe he lied about why they divorced him.

He then meets third wife and once again cheats on her.

I don't see what's confusing here. Even if he didn't cheat on first two wives, and really does it matter what he did in his previous marriages? He cheats on his third wife. And that what matters and should be a concern for his third wife.

I'd say it's good he avoids sex as it is too scary to have sex with cheaters: STD etc

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