>Many women, at least by my anecdotal experience, see sex as something that they give up, and are expected to, after certain checkpoints in a dating relationship.
This is absolutely absurd and I don't know what kind of women you are hanging out with. I've had frank honest women to women discussions about sex and relationships and this sentiment has never come up. EVER.
>I mention Manhattan for a reason: it's got an unbalanced gender ratio and the highest percentage of single men in the country
This is absolutely false.
http://www.theatlanticcities.com/neighborhoods/2013/02/neigh...
http://nycedc.tumblr.com/post/16175652438/ratio-of-single-me...
http://www.glamour.com/sex-love-life/blogs/smitten/2012/10/s...
>The men were upset they weren't having sex. The women date, and have sex if they want, but are somewhat resentful about it because they'd rather settle down.
The survey I presented above does not support this.
Here's a better writeup
http://abcnews.go.com/Health/survey-shows-single-men-commit-...
and here's another:
http://magicbaltimore.com/3386661/more-black-men-want-to-set...
Nearly 43 percent of single black men said they’re looking for a long-term partner that can eventually lead to marriage. That’s according to a new poll of nearly 1,100 African-Americans out today from NPR, the Robert Wood Johnson Foundation and the Harvard School of Public Health.
The survey asked questions about a wide range of topics, including communities, finance and dating. Respondents between 18 and 49 years old who were divorced, widowed or never married were asked whether they were currently seeking a long-term romantic commitment. Roughly half of the men said yes; just a quarter of the women said the same.