Why do men sometimes put the word man in front of words?

A man purse looks different to a purse
A man hug is different to a 'normal' hug

You're overthinking this, shhh and let it be

A purse is a purse no matter what it looks like. A hugs is a hug no matter what happens during it.

What difference does it make?

The use of the word man makes the object or action different from "normal" things.

You're man-overanalysing this.

The use of the word man makes the object or action different from "normal" things.

...unless it is not entirely serious. No self-respecting adult male would seriously try to distinguish any of these things by his gender. You're presuming that some inherent difference is perceived because men are doing it but I think when men and women do this they are poking fun at the sensitive male ego and societal pressure to appear macho at all times. By putting 'man' in front of 'bag', they are mocking the fact that in society things such as these often are differentiated by gender - such as blue for boys, pink for girls; by differentiating in this ridiculously self-conscious way on matters and things which usually are fairly asexual socially people are humorously criticising exactly the sort of attitude you are under the impression they are promoting.

...that being said, there are some instances where it has more serious practical value, such as in 'man crush', which can be used when a heterosexual male wants to express admiration for a man without giving the impression that they swing that way...

Man-purse, man-hug, man-whore, man-slut? I don't get it, I don't think it's needed, a purse is a purse, a hug is a hug a whore/slut, is a whore/slut. I don't think gender/sex matters at all.