I like to play as the MC. The authors via MC dialog give an idea of how they want things played and I follow that. Aggressive words. Aggressive playstyle.
I typically use the default name for the MC in games. I like to experience it through the developers thoughts. I will use a name if I am forced to pick something, but otherwise it is just what the dev preassigned the name to be.
I generally tend to make the decisions that I would make in real life, or as close as the game allows. Or more specifically, I tend to make decisions that I would make in real life if there were no consequences to them. I don't descend into evil by any means, but certainly more lecherous than I can get away with in real life.
I will never use the default names for male MCs as I like to create my own MC and make his decisions for him. Female MC I keep the default name coz they don't suck like the male options. And I will never play any MC as myself, coz I usually choose the most perverted options
I don't play "myself", but I do role play has someone who has a somewhat similar outlook to myself... Basically I don't feel very comfortable keeping a very different persona, since it make RP harder for myself. I try to follow game hints regarding rewarded behaviour, though, so sometimes I need to deviate a little.
There are some aspects where I like to play my characters as I see myself, for example I don't like to have them act rude or mean. But in particular when it comes to porn-specific things there are huge differences. For example, I'm not interested in having sex outside of monogamous long-term relationships with an age-appropriate woman I'm not closely related with. That is pretty much the opposite of what I'd want my typical AVN MC to do.
I have always enjoyed playing characters who are very different from me.
I like video games (sexual or not) to do things that I wouldn't do in reality (murder, rape, incest...)
I let certain aspects of "me" play in my character, but it's still an imaginary thing. I don't do rape or heavy brutality. Played a couple of VNs that the MC was just written way too dark, and the dark elements were unavoidable, so delete, shred, done. There have been others for similar reasons, but I'm not the type to treat the threads like an airport.