I am pretty direct about these things to be true to myself and to a partner, simply, there is absolutely nothing wrong to let someone know you might be intimate with, in whatever time it should come up, that you are, "saving myself for marriage." Know what signs of affection you are comfortable with (hand holding, hugs, kisses, etc.... if so/not) and can let him know this too, talk to him. Open and honest. If he respects this, he is a keeper.