Check out the book "The Red Queen". The author points out that even chromosomes fight for survival at the expense of other chromosomes and the body. X chromosomes try to destroy the Y chromosome, for example.

https://www.amazon.com/Red-Queen-Evolution-Human-Nature/dp/0...

This is one of the most fascinating books I've ever read.

It does imply that. I know a lot of guys who have gone through a period in their life not being able to sympathize with women after learning about this. They would question why even bothering marrying a woman if she is just going to be a cheating whore?

The second point you make is very interesting and I have the perfect rebuttal. Unfortunately I don't have the book with me right now but a quote from a review on Amazon will suffice:

"And on pages 217-218 [Matt Ridley] explains why women cuckold their mates: "This is because her husband is, almost by definition, usually not the best male there is-else how would he have ended up married to her?" She wants the parental care of her husband and some other man's superior-she thinks-genes."

Here is the link to this book (one of the best I've read): http://www.amazon.com/The-Red-Queen-Evolution-Nature/dp/0060...

And although I haven't read this book (if you do, tell me what you think), I know that it talks more about how x% of children are not genetically related to their fathers: http://www.amazon.com/Sperm-Wars-Infidelity-Conflict-Bedroom...

An ad hominem attack with a dash of appeal to authority...enlightening. If you require proof of sexuality's impact on human behavior, I recommend reviewing the extant literature. Here are some examples:

1. http://www.amazon.com/Red-Queen-Evolution-Human-Nature/dp/00...

2. http://www.amazon.com/Moral-Animal-Science-Evolutionary-Psyc...