Exactly.
Why is this so important to you OP (original poster)? The obsession and underlying biphobia and homophobic BS some queens on this site have when they learn that *GASP* OMG my favorite porn guy or EX BF had sex with women and is not a gold star gay! He must be bisexual! There is no way a gay man in the 1960s and 1970s would ever have sex with women! I read this BS on a forum where there are bisexual women and all types of people but the majority of people there are lesbian women who insist that any lesbian woman who was once unsure, closeted, in denial, etc. and dated, had sex with or even married men is really actually bisexual and there is no way she is lesbian.
Al Parker was a super vapid porn star, stayed stoned all the time he was awake, was known to lie especially in interviews with porn magazines, was selling himself as an escort and fake image, and in the biography I read about him he said he thought he was bisexual as his first sexual experience was being raped by a man as a teen or young adult, he had sex and dated women as his family pressured him to and then discovered that he is gay. This is not uncommon. I have a gay friend who in the late 1970s and early 1980s when he was living with family and closeted and in denial did not want to be gay then-he dated and had sex with a super low number of women as he did not want to be gay, coming out as a black gay man was at the time in a major USA city seen by other black people as the worst thing a black man could do, and he said that he had to think about men the entire time to get hard, stay hard, and finish and sex with women just showed him how he is gay.
I read the biography about Drew/Al someone linked to in it he says how he could force himself to have sex with women by thinking about men but he did not really have any sexual attraction to women. Was he bisexual? Was he homosexual? Only he knows. Does it matter?
