Vigilant - just as an exercise, can you do this:

Pretend you are going on a "sex interview". The interviewer is your wife and is who you are applying to have sex with, but pretend for the exercise that she is just a beautiful woman and you want to seduce her.

Now, tell us what you will tell the interviewer to convince her you would give her a good time in bed. You don't have to get graphic about sex acts you will perform or whatever...just tell us "why" she should want to have sex with you. Leave out anything that sounds like "because I love you" or "because I'm a good and faithful husband". Those items are moot.

See what you can come up with. There is a reason I am asking.

DQ