and Pregnancy? twins?

My husband and I went to the doctor thursday for a check up (I'm Pregnant). I'm about 19 weeks and we just found out I'm having not one, but two babies. Twins! :D Then, ever since we got home from the doctor, he constantly wants to have . It's perfectly fine but he hasn't been like that since before the pregnancy because when I got pregnant he originally thought that would be dangerous for the baby. Like I said it's constant, multiple times a day. So I have a few questions, I'm not a high risk pregnancy, but is going to jeopardize this pregnancy in any way? Why has he all of the sudden decided is ok, when before he was scared to have with me? Any women have a similar situation? And finally, what is the best way to make this more comfortable for me because my belly is getting in the way. I'm a really small woman, so my belly is sort of taking over haha. I'm sorry if this is a TMI it's just something I'm not comfortable talking to my doctor about.