Lindsay - I don't know if gender has any affect whatsoever on your sex drive, I was the same as you in my first pregnancy - always wanted it!! from about 14 weeks on I was insatiable!!
This one, meh... can take it or leave it.. I think in nearly 24 weeks we have done it.. uh..... twice???! haha!!!!!
And I had a boy first.. as you know.. so maybe its a second pregnancy thing!??!