Even if marriage was imminent, what about when you hit 40+? Is he going to resign from sex because you're past the childbearing years? Does he plan on knocking you up every year, then withdrawing from sex once you're pregnant?

There's some moral issues going on, not to mention his shame surrounding a natural act. If this relationship is to be salvaged, he needs to be bothered by his own new found abstinence enough to seek help.