I'm not quite sure how seriously to take these numbers, though. If 29 straight guys found a partner through the LW community, and a total of 14 straight and bi women found partners through the community, we need to have men to be about twice as likely to take the survey as women.

That seems fairly plausible to me, actually. My impression of the community is that the physical side of it is less gender-skewed than the online side, although both are mostly male.

There's also polyamory to take into account.