Here's some advice: give him head and find out for yourself.
The taste of a man's ejaculate really depends on what he eats, to be honest with you. The more sweets and red meat he eats, the sweeter it will taste. The more citric acid (from fruits) he eats, along with garlic and other salty foods, the saltier it will be. Personally, my fiance's cum is sweet, and I always swallow it, but that's my choice. The consistency of it is kind of like mucus, but I won't go into any more detail than that. If you think about it too much, it will probably just gross you out. Just think that this is someone you love very much, and it's not about the sexual gratification from it. Do what feels natural.