Every time the party encounter a FEMALE they have to comment on their body and if they'd have intercourse with her or if she isn't hot enough to be worthy of their attention. And if all of them say no but one says he'd "do her" all the others have to mock him for his low standards (see moped).

They all have to one-up each other all the time on all kind of small things.

No one can ever see another man peepee. They all have to refer to their peepees with highly sounding names that confer absolute potency (e. g. the horn of breeding).

Their horses/companion animals have to be waaaay oversized and impractical, with no real bonuses and lots of drawbacks (e. g. Brutus the destroyer, a 100kg dog that is slow, eats all the time, shits copious amounts that they have to pick up and has a dps of 2, and love scratches behind the ears).

They have to carry wallets swords on their back because it looks cool but it's absolutely impractical. A couple of true stories on this last bit: my dad once told me I should start putting my wallet in my back pocket "like a man". A friend of mine got back problems because he used to sit all day with his wallet on his back.