What so?

Perhaps, '坏' is something, 好男人 doesn't have;

Vise Versa, 坏男人 must also posess some 'Badness' that 好女人 is lacking of.

One condition, that I can think of on the top of my head at this moment, may be that, as in an Open Market, We're Too Much and Too Often Driven By Needing, Wanting, etc. superficials -- surface values.

For example, as simple as Curiosity, which can actually play tricks on our minds. Eagering to Know, which normally would consider as a positive quality of our personality or in our habits, but under other circumstances it can also be brought out by fears rather even than necessary, can't it? Especially, when we have grabbed more than we can chew, we can be dragging down almost instantaneously out of even our own control, can't we?

Internal unclean motivation existing, such as, 自大, 高傲, 甚至 狂妄, or simply doesn't used to open ourselves up enough, can all lead to us attracting 小人(Little Person) into our lives, which may appear coming in to help us solving problems (meet some of our needs) to start with, or on the contrary, they're showing obvious problems for us to Do, to Help (an opportunity to grow our ego, to show our usefulness or goodness, isn't it?). Now, we detect that there's A little pity me, actually, is living inside us.
 
No matter what kind of excuse we may come up with. While, unfortunately, we are falling short of God's glory, instead, becoming victims.

Why, 男女之间 is much easier 偷来偷去, than people who have the same sexuality (we're having 同性恋 as well, unfortunately)?

There're genuine Attraction, Blindness from one another, and Needing for one another there as well, which would make the stealing behavior easier 上手, aren't there?