Do men really have times in their lives when the have no sexual desire?

[Julie Grudes]

My Fiance is going through a really stressful time right now. I know there is a lot more stress than he is even letting on to me. I know he does not vent to anyone at all really. Over the past few months he has stopped calling me sexy or acting horny at all. I finally asked him about it 2 weeks ago. He said it was not me, but that it is hard for him to get in the mood and that his desire is gone right now due to all the stress in his life. I know the school of thought when men act less desirous of the woman they are with and the sex seems to have really slowed down...thats why Im asking....does this really happen to men? We are told that if a man acts this way he is getting it somewhere else because a man always wants sex. The few men I have talked to say that yes it happens where stress just kills desire. Please be constructive...I just want an answer to the question not an opinion on what he may or may not be doing.
I should add that we are not together a lot. We live in separate areas and our work schedules make it so we are not together a lot. we do not live together yet. When we do get together we have a lot of fun! I have no doubts this man loves me at all. When we can be together physically we do take advantage of it, so it's not like it has stopped completely. His stress is family and ex-wife related and financial due to the divorce with her. The issues he is going through has put stress on our relationship and caused us to have fights and disagreements as well.