Yet another thing to feel guilty about, but although I'm run off my feet with twins I haven't lost my sex drive (despite hearing so many stories to the contrary - I even feel guilty about it because my mum once said "once you are a mother you are on a higher plane and don't think about sex any more"!)
But where would I meet anyone, even a casual partner? Can't really hire a nanny for a day and go and sit in a bar and ask a randomer at 11 o'clock in the morning. Not in the mood for internet dating either, really - bad experience.
Do you friends have anyone they could introduce you to? Do you have any single girlfriends if so maybe you could get a sitter once a week and go out with them. Other than that I'd say give internet dating another try maybe try a different site.