I'm of two minds when it comes to this issue. If you are having a hard time dealing with it now and you know that a change in his behavior is the only thing that will help your feelings then I definitely believe you should think hard before you marry him. If you can live with the fact that you will be compensating and making adjustments regarding something that you value then go ahead and marry him.

There are so many factors that go into making a choice like this. Which is more important to you...having sex with him or sharing your life with him? You've lived with him long enough for the newness to be off of the relationship, you guys have settled in. Are you finding that the lack of sex is a big issue for you? If so, it's only going to get worse after the marriage, not better.

Are discrepancies in sexual appetite suicide for a marriage? I don't believe it has to be. Getting married does not mean getting 100% of what you want. It's give and take, sacrifice and being willing to compensate. I think the bottom line is this....if you can go into a marriage fully aware of the differences with no expectations for it to change and knowing that you can be happy with the adjustment you will have to make then no, it isn't suicide.
Cathy