oziguy saidThis whole thread, though interesting, is of no use whatsoever since all posters seem to be commenting from personal experience.
Does anyone know of any proper scientific study where the results indicate an answer to the the question?
And even if there was, I doubt that the results would be reliable.
I do not know of any reliable statistics for the current situation. However, in the 1970s, there was reasonably reliable information available.
The "Advocate" used to have a personals section which guys used to find partners. The advertisements were very specific about what was wanted. Here are the abbreviations used:
FA = French active, i.e., gives oral
FP = French passive, i.e., receives oral
GA = Greek active, i.e., anal top
GP = Greek passive, i.e., anal bottom
V = versatile, i.e., anything goes
From the advertisements, one could estimate which actions were most popular. It was obvious that oral was very popular and that anal was not very popular. Many gay men wanted nothing to do with anal sex. It would seem that there has been a change since the 1970s because now guys talk about top vs bottom which implies anal sex.
It is not clear what has caused the change. However, since the change has occurred, it probably is not the result of in-built proclivities; it is more likely a response to what gay men think is expected of them.