It will aways be harder to attract/keep women on a dating site than it will be to attract/keep men. That is why almost ALL advertising for dating sites on TV is targeted at women, IMO.
Further, if you start with a domain like inlu.st, you are eliminating the % of women that actually care about long term relationships over one night stands. That is a very large %.
Ah yes. I'm not particularly going after LTR-seekers right now. Of course, this might change in time, and I suspect the name might have to change in that case.
Why not specialized frontends on a common backend? Common accounts for "inlu.st" and "solone.ly" or something, but with ability for activating/deactivating visibility on some domains.
I think that both the and community requirements can be very different for casual contact and ltrs, but there will be some natural mobility between those.
Further, if you start with a domain like inlu.st, you are eliminating the % of women that actually care about long term relationships over one night stands. That is a very large %.
Just my opinion. I have no data for you.