I must be the odd one out?
We have had gaps in our sexlife over the pregnancy due to work and health reasons (both mine and my partners) however we have still been active until last week or so and I am currently 33 weeks...
I am at the point of giving up only as I am huge and my partner has a bad back! if we could find a comfy position we probably wouldnt give it up altogether just minimise it unless the docs said otherwise!

If I was told not to or I felt unhappy about it then I would stop.. but so far we havent had to. However I think we have hit the extreme point of discomfort due to size etc..

just my experience...