stuart67, there are some excersises you can do to tighten up your vagina. I'm not sure if you've heard of them but they're called kegels. What you do is flex your vagina muscles. A good way to find out the correct muscles to squeeze and the best workout for this is when you are going pee, squeeze your muscles to stop the flow. Do this 3 or 4 times during urination everytime you go pee. After you've figured out what muscles to use, you can do it all the time; in the car at every red light, watching tv, while your on the computer, anytime!! make sure you do it as much as you can everyday. It may take a few days to notice the results but it does work, I've figured this out from personal experience. And your hubby will notice too. I wish you the best of luck and I hope my advice helps you. Let me know how it works.
-Hunny1986
Maybe you're producing an unusual abundance of vaginal fluids (perhaps, due to hormonal fluctuations?), thereby, making it easier to "slid in" ...and making it only seem as though "something bigger" than himself has been there... although such is not the case.