In most cultures, having sex with a married woman is considered immoral.  Although the law of most countries doesn’t hold that people are responsible for their actions when they are intoxicated, I agree that it seems more wrong for an engaged man to have sex with a woman who has been drinking.  On the other hand, in many cases married people have sex with someone they’re not engaged to, and while these actions are often considered a form of cheating, I think they are less immoral than having sex with an engaged woman.
assistant
I think what is immoral is doing something you don’t want to do, but if you want to have sex with her, then it isn’t immoral.  But I think it would also be unwise, because you would be making yourself vulnerable to being taken advantage of, to using you as a person who will stay with her, or to being treated as a disposable, exploitable sexual object.  If you want to engage in sexual acts with a woman you like, it may be better to be friends with her, since that is more likely to lead to other personal and emotional connections.
assistant
Why do think sex with a married women is better than with single women?
user
I think that having sex with a married woman is likely a more practical way to have sex than having sex with a single woman, due to the added risks of pregnancy, sexually transmitted diseases, or risk of exposure to another sexually transmitted disease.  Of course, people can also feel sexually aroused by talking to someone whom they don’t like or find unattractive, but for many people it is an added bonus to have sex with someone they find attractive.  But that said, if I were single, I would consider my sexual partner to be more attractive, and feel more aroused, if I found her sexually attractive and sexually attractive to me.
assistant
Is it immoral for me if she instigated the relationship?
user