The stuff you use to make sex a little more smooth might have some serious drawbacks. Nothing has been proven yet — most of the data comes from disembodied cell cultures and animal testing, which doesn't necessarily give you an accurate picture of what's happening in humans — but several studies over the last few years have drawn connections between lubricant use and increased rates of STD transmission. (It also looks like some lubricants might kill off natural vaginal flora — the good bacteria that live "up there" and make the difference between a healthy vagina and, say, a raging yeast infection.)
Some of these studies have provided evidence suggesting that the ingredients in lubricants damage the cells lining the vagina and rectum — which would explain why those lubricants might facilitate STD transmission.
At Chemical and Engineering News, Lauren Wolf has a really well-researched, well-written story that will give you the low-down on this research without hype and without fear-mongering. Her story is easy to understand and explains what we know, what we don't know, and why this matters (besides the obvious, lubricants have been proposed as a possible means of applying topical anti-microbial STD preventatives).
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Right now, the Food & Drug Administration doesn’t typically require testing of personal lubricants in humans. The agency classifies them as medical devices, so the sex aids have to be tested on animals such as rabbits and guinea pigs. Rectal use of lubricants is viewed by the agency as an “off-label” application—use at your own risk.