Augustus
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Paul states explicitly in his writings that he has no desire to have sex with women. If this is true, the only possibilities are that he was either asexual or homosexual. Given that homosexuality is more common than asexuality, I would wager that he was homosexual.
These are not the only possibilities.
Sexual abstinence has been practiced by many ascetics from diverse religious and cultural traditions. Seeing as we know he was very devoted to what he saw as his religious calling, this seems a highly plausible interpretation.
In general, the trend for "outing" historical figures without any real evidence is a bit silly though and is often based modern day ideological considerations.