I wouldn't be one bit surprised to find out that he was. He was raised by Leftists. Leftists treat homosexuality as normal. His family placed him in the care of openly homosexual caretakers and mentors who had ample opportunity to molest and indoctrinate him. Quoting Seinfeld: “Not that there is anything wrong about that.” Combine the above with his Muslim influences, and it is very possible that he was molested. Although homosexuality is supposedly immoral by Muslim standards, there is a tremendous amount of homosexual behavior that is accepted as normal. They just call it something else. See
http://www.foxnews.com/politics/2010/01/28/afghan-men-struggle-sexual-identity-study-finds/
There is also that photo that has been posted many times on FR that show Obama and his Pakistani roommate sitting closely on one half of a couch together. Far more closely than typical straight American men would sit....