there is really no such term as nasty sex.its just sex.
it depends on what relationship she shares with you. (e.i. Wife, Sister-in-law, etc.)
it turns him on... and if the wife wants him to talk nasty then tell him
Have sex with them
He liked the sex. He's trying to have you and his wife at the same time.
I am not quite sure what you mean with "good"... Most religions would agree that there should be certain restrictions to sex (usually: that sex should be between a man and his wife). On the other hand, having several sex partners, or changing sex partners often, is dangerous, since you can catch some nasty diseases.
His wife said to him to try to convince his boss to give him a pay raise.
Yes, a wife can refuse sex to her husband. If the husband were to force his wife to have sex it is rape.
Stay faithful
How do you convince anyone o do anything. WIIFM - or What's In It For Me applies. Find out what her hot button is and explain how she will be rewarded with that.
no because if the wife doesn't want to have sex, it can be classed as rape
Well, if you and your wife have a consensual agreement for her to engage in extramarital activities, then technically speaking, it's her prerogative. However, I'd suggest having a serious conversation about boundaries, expectations, and the potential consequences before diving into that kind of arrangement. Good luck with that whole situation, honey.