I've never heard of the expression, "sides" but if the definition is "A Side is someone not into anal sex", then I am a "side". I've said many times on this forum that I am not primarily into anal sex either in my porn or in my personal life. I am very much into oral sex, mainly giving it. I've seen the expression of being an "oral bottom". A more common word is being a "cocksucker". lol. My special turn-on is giving a blowjob to a hot young straight guy, hence watching a cute straight guy on
Broke Straight Boys getting sucked off is my favorite here as well. But in porn, watching a straight guy fuck a guy can be hot for me to watch as well.
I belong to a free forum called menwhoswallow.net. There are "feeders", guys who like to be sucked, "eaters", guys who do suck, and guys who do both. I've found it interesting over the years, reading that site to discover that being a "cocksucker" is not necessarily the same as being gay. There are many men who've posted there over the years who are married, or in committed relationships with women, say that they love them, and have sex with them who are also cocksuckers. There are also guys who are married and like to fuck their wives, but who enjoy getting sucked by other guys. And there are gay men on that site who enjoy both oral and anal, but we focus on the oral over there.
I've read the following phrase so many times both on that site and in other online reading over the years where a guy says, "I am not attracted to a man. I don't want to kiss them or be in a relationship with them. But I like to suck cock". That is not me. I do find men very attractive and I've been in relationships and enjoy kissing, holding and hugging a guy. But even when in relationships with men, but I am not particularity into anal. I've done it to keep my partner happy, but first and foremost sexually, I like cock and to me a fine ass is great for admiring and touching and even kissing or tasting, but not for fucking.
The longer I have lived my life, the more I keep discovering that there are endless variations to human sexuality. Yes, I am most definitely a gay man, but not a typical gay man in many respects, including not being into topping or bottoming as my primary way of having sex. Human sexuality is very complex and there is no label that defines any one human being.