I'd say ur at least bi if u like getting ur ass pummeled by something that's very clearly supposed to represent a dick. traditionally speaking i dont think heteros have been putting dick shaped objects into their ass unless it's vlad the impaler doing his thing. to put some emphasis on that:
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the shape with a round tip similar to a dick? what a coincidence. you strap it on exactly where a mans dick is? another coincidence. which leads to having position yourself in the way of a woman/gay dude (doggystyle, missionary & etc) in order to do it? most definitely a coincidence. . .
another notable detail is that when ur playing this game, you typically jerk off your dick. so when the in game character gets pleasured on his dick (which he pretty much always does) you also please your dick. it's immersive and makes sense. but if it's anal it's not as immersive to jerk off ur dick when ur ass is the target in the game. you'd have to resort to buying a dildo and fucking ur ass which i dont think most people have + its highkey bisexual.
while i'm pretty desensitized, i'm not completely desensitized as to allow myself (as a 100% straight man) to get fucked by some dick shaped object. it's still been fun talking to u guys about this though since i better understand u guys mentality on this now. all of this is just my opinion and shouldn't be taken to heart