While I was out of work, I tried to increase my "network" as much as I possible could, so every single day I would start sending out connection requests. I have made a VERY interesting discovery since I've been doing this. Even though Linkedin is a CAREER NETWORK and not Match.com, I get dramatically more accepts from women than I do men. I get about 50-75% acceptance from women, and about 5-10% from men. It's exactly the opposite of what I would have expected. I have continued to send out random connection requests even after I came back to work just to build my network, and it's largely the same now that I'm working.
It's like men are threatened to be connected and women see it exactly as it is......or they just are programmed to be nicer, so instead of "hurting my feelings" they just accept.