@sjg: "Most sexual interactions between men and women have the woman seeking some kind of extrinsic benefit, like money, material, or social advantage."
No, this is just not true. In the vast majority of couples I know, men and women get together because they are attracted to one another, see the other person as a solid partner to build an equal life with, or both. Relationships aren't transactions, they're mutual partnerships.
Now in your case, I could see how you might have arrived at this opinion. You let us all know that you had some kind of mail order bride from Mexico, and haven't been married otherwise. Did I get that right? If that's true, of course someone in that position is after your money. If that and sex workers (however you hand them money) are your experience of women, then I can see how you arrived at this conclusion, because they actually are literally all just after your money. Because it's their job.
If you only ever ate out at restaurants, and literally no one in your life had every cooked you a meal because they love you and want you to eat something tasty, but rather every single person that cooked you a meal did it because they were looking to get paid for their time plus a tip: you might very reasonably come to the conclusion that cooks are just out to get your money. Because they are!
You are generalizing your limited experience to a wide world of women, and showing your lack of experience.