grinchie - I spent 18 months in two stints, if memory serves, on POF, plus 6 months each on Match and MSF. I had a look at GSM a while back but, really, if you're not in London or one of the main cities like Manchester or Birmingham, it's next to useless.
I can understand women in their 30s who want kids and don't yet have avoiding guys who can't/don't want, but I was surprised how many single mums in their 30s still want more or are 'undecided'. Unfortunately although they are 'undecided' they won't date me because I make their decision for them, rather than them making it themselves (I've been told that by several women).
It may well be just this area. There are plenty of people in their 30s, but single ones seem to be in very short supply - both in RL and OD. I know others (who do want/can have kids) find the lack of singletons a problem, although it's not a sparsely populated area.
In the last year I have tried two book groups, two badminton clubs, one cookery class, one art class and joined yet another drama group. I think I may have exhausted most things except salsa dancing (which I did try twice but I was completely hopeless).