Uh where are you getting this info? I've never heard that ovulation could be smelled through shit and frankly that doesn't make any sense. Urine, maybe.
And the idea that sex wasn't consensual in early hominids is outrageous. Rape is not the predominate reproductive strategy amongst any social primates. It is also not very common in hunter gatherer societies.
http://www.ncbi.nlm.nih.gov/books/NBK55973/
That site explains a lot. But I had heard it being released through feces in one of my psychology classes. That site more refers to animal behavior (though we're all descended from that, anyway), and it seems that different animals release pheromones in different ways, the one I mentioned being only one.
And I didn't mean violent rape when I said that. I meant that it was mostly men picking the females who they had sex with, mostly for procreation (we don't know for sure at this point if they ever did it solely for please or not.) And of course women were aware of the need to procreate, so they would submit. I'm not sure when or how the cultural shift changed, but I'm pretty sure this is how it was early on.
What I feel is stranger nowadays is that when it comes to procreation, it's more often the women selecting the men, almost a complete subversion of how it used to be. Some women today are perfectly fine being single mothers, and often, older women who want a child will settle for men less than them. These are often career oriented, well-educated women (i.e. they've been focusing on these areas of their lives before having a child) who will marry just about any guy. With guys, we can knock up a girl at any age, so long as we can get it up. We don't have to worry about that like they do.
Though when it comes to plain sex, guys seem to be just about finding the most attractive woman. With girls, they want one who they think can protect them - though not just physically. Despite being tall (6'2) and relatively good looking, I've had absolutely terrible luck with women. I assume it's due to my lack of self-esteem - which is the number one thing I hear girls say they want in a man: confidence.
So basically, you want me to be a self-important, narcissistic asshole? Yeah, okay bitch. You win.
(Apologies for any vast generalizations here, I'm speaking only about my own experience.)