Speaking from personal experience, finding the right relationship can be HARD. I recently came across a rational take on finding relationship partners, much of which really resonated with my experiences:
http://waitbutwhy.com/2014/02/pick-life-partner.html
http://waitbutwhy.com/2014/02/pick-life-partner-part-2.html
(I'm still working my way through the Sequences, and lw has more than eight thousand articles with "relationship" in them. I'm not promising the linked articles include unique information)
I often hear claims like that here on LW, but they sound very implausible to me. I never had a girlfriend until I was 26 but I'm not under the impression that before then I was deficient in otherwise dealing with female friends/professors/etc. in a way that I no longer am, or in a way that I was not with male friends/professors/etc. (In particular, in most of my late teens and early twenties I had many more female friends than male friends.) Do you (or anybody else who's been making such claims) have any evidence (that could be easily shared on a Web forum) of that?