Ah yes, the world of statistical probability and how it factors into acquiring and/or transmitting STDs.
Let's first deal with the facts. A surface abrasion on a penis is usually a superficial scratch or rubbing that irritates the top layer of skin. The probability of the HIV entering from a surface abrasion is minimal if any at all. However, if you have had any bleeding from any of the large blood vessels near the surface of the skin on the penis itself, it is possible for the HIV to enter via that route. Next. You don't know the other guy's HIV status, so you don't know if you might have been exposed. It is always this fact that causes people to get seriously about HIV exposure -- after the fact.
If it will give you peace of mind to get tested, then by all means get tested. What is the chance you may have been exposed? I don't have a statistical probability for what you have described because I don't know just how superficial the skin abrasions were on your penis. But, why leave something to chance anyways if you are that concerned? Given the fact this other guy didn't care if you used a condom when he sat on your penis, he's a prime candidate for acquiring STDs and passing them on to other potential candidates -- including YOU.
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