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In my experience and in the experience of those around me, this is not a problem, except in one way: I do know runners who must run every day for the "high" caused by the endorphins. If they miss many days, they get cranky. And so they tend to run through pain, so that minor problems -- minor stress fractures, things like that -- become big ones. Because they just won't stop. My neighbor's like that. She had a cast on for a month, and had to stop running for three months, because she just wouldn't give herself time enough to heal. We're talking about a 40-odd year-old woman running at least, every day.
I would argue that somebody with a bad back and bad knees maybe should _not_ be playing basketball for 5-15 hours a week, and that this may be exascerbating the pain. So: are you doing it because you feel good and relaxed afterwards? Are you doing it for the endorphins? If so, you might be causing yourself long-term pain for short-term rewards.
As for hot food, back rubs, sex: I had a bad back for 20 years, and I had a lot of all that during that time. Didn't have any adverse effects that I know of. Didn't cure the back pain, either, except maybe short term.
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