It is a nutshell version of what I said here:
http://micheleincalifornia.blogspot.com/2014/03/the-gray-zon...
That piece made the front page, so I suspect some folks here have context as to what I mean: That women have trouble getting men to engage them in a meaty way. Many men err on the side of caution, as I stated above. Heterosexual men have a tendency to engage women only superficially, unless they are looking for a romantic relationship. No, not all men do that. But a high percentage seem to and it's problematic.
I regret that it was probably not the best way to express it, but I'm not sure there is a good way to say it in brief.
This is just very, very sexist, and I'm surprised nobody has called you out on it.