I was on the pill for about 10 years before it completely destroyed my sex drive - I went off it about 8 months ago, and just got the Paraguard IUD put in about 2 months ago.
So far I love it, but I'm definitely finding it harder to lose weight since it's been in. After doing some research, I guess it's something that a lot of women experience, but that doctors aren't too familiar with. Some theories are that a) it's tricking your body into thinking it's pregnant, so it holds on to excess weight, or b) because it's a constant stressor on the body, it leads to stress hormone production, which again leads to the body retaining fat reserves.
But even with that, I love it. Maybe it's tacky to say, but I'd rather be this weight and love sex than down 30 pounds and unhappy!