I read your post. I my opinion, your weight is not as big a factor as age unless you have put on a lot of weight. I'm not young enough to sling my legs over my lover's shoulders anymore, and my knees are too sore to kneel. So I have to either bend over a chair or lay on my side. Use of a body sling is also a good alternative, but not always something I carry around with me.
However, I would also recommend that you have a prostate exam to be sure there aren't any underlying problems. Just remember it is not proper to hit on the doctor if he puts a hand on your shoulder during the exam. However, if he then puts his other hand on your other shoulder, it is okay to kiss him because the exam is over and that is not his finger in your ass.
