I can't tell you from my experience since I got divorced just before getting banded, but from what a have noticed, a lot of women seem to get pregnant once the weight starts coming off, so it is safe to assume that sex took place lol. To be honest, deep down you will know if the lack of sex is due to your weight or other factors. My advice, don't make assumptions, if you lose weight and sex is still not happening don't be afraid of asking your husband what the issue is. Men are not mind readers, if women don't tell us what is wrong, we usually go on believing everything is fine the way it is.
Hope this helps