Should I seduce my friends boyfriend so she will get the point?

My friend is a 19 year old hottie that looks like Nikki Minaj but she is wasting her time with this 32 year old guy from Australia who reminds of any white guy from Australia. Its sad to watch him and her together. At the club everyone makes fun of him because he doesn't fit in. I really hate to see her like this but I try to talk to her and she just ends up acting crazy. He told me once he would not mind having a threesome with me and her so I think I can get him to sleep with me. Should I do it? She may start hatin on me but she don't need him. If I can save her from this fool I will do but not sure it will work.