One of the main outcomes of the internet is it has allowed people to find others and create online communities along specific and narrow worldviews. Bitcointalk and this thread are quite normal in that view, many people here (both men and women, my wife being one of them) find the same humor funny.
This is the exact behavior that keeps women away from bitcoin forums like this. They don't want to be on a forum filled with men making the same old sexual, disparaging and offensive "jokes" over and over again. You'll have to see this from a women's perspective; for them it's not just the one joke you posted, but hundreds or thousands of 'jokes' year in year out. They get really tired of that shit.
If you really want more women into bitcoin, you need to be open, respectful and friendly to them, not chase them away with childish "jokes".
Personally, I find "women" oriented blog and forum sites to be the most offensive sites of all. I've come across many that exhibit offensive opinions and what can only be described as hatred against males, women with children, etc. It is on those women sites where it is acceptable to have views that some people are better than others. On bitcointalk, it's just humor that few here seriously believe.