That is quite a worrying attitude, to be honest. I agree with sdcott about maybe asking him not to go to the nightclubs. To be quite honest with you, I don't understand why married people want to go to nightclubs - because to me they are full of drunk, desperate people(of both sexes!). But that's just me.
I think you need to explain to him that you would absolutely NOT accept him engaging in the kind of behaviour his colleagues did, and if there is any chance of it, you want him not to socialise with them at all in settings such as these 'nightclubs'.
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