I would like to agree with you Molly, it can be asscary place and my deeling is that there are confidence issues involved.
I won't normally post facial pictures on any sites I frequent mostly because I would be mortified if anyone outside of those sites, ie friends or family, recognised me. A site like this is for many, me included, a very private place for fantasy as well as fact. People post stories, sometrue and some fiction.
I applaude those who feel confident and open about thier sexuality to be comfortable posting face pictures, it is just not for me , and many other too I suspect.
Personally, I like to see some sort of picture of a member as that can give so much about a person. Honestly, just a shot of someone's genitals (male or female) doesn't do much for me but it is possible to give subtle hints about oneself that can tell other members a bit more than just a few lines in a profile.
I would urge people to get involved. I love that there is now a site for bi people, it must be a first so let's ce;ebrate what we have and enjoy it all.