Being a drunk driver is illegal and places the lives of others at risk. So no, it's not the same. Also, "mitigate" means to lessen an offense, not completely excuse it. I'm thinking that there's some difficulty with reading comprehension happening here because I made multiple posts in which I clearly stated that it does not entirely excuse Clara cheating, nor does the character herself even believe that based on her own words. Plus, drunkenness was not the only mitigating circumstance. She also was emotionally vulnerable due to witnessing an event that she was manipulated into seeing out of context, and then she further was targeted and manipulated by the insistent schemer Leon.
As for your penis comment, I'm not sure what your point is. If you're referring to Alan, he has not shown an inability to have an erection. He undoubtedly was experiencing some anxiety when Clara dropped to her knees, strangely dressed, and said she wanted to play a game in which she expected him to cum within one minute's time. Besides that, I find that viewers of AVNs and their developers tend to be big dick obsessed, which is unfortunately not surprising given that most viewers and developers are men. As has been previously stated in this thread though, it does not require much length to stimulate a woman's clitoris or so-called G-spot, and in the case of women pleasuring other women (who reportedly can more consistently provide other women with orgasms compared to men), it does not require having a dick at all.
