I started with my husband, who is at least used to me seeing him naked. Mostly he thought it was flattering, sweet, and kind of fun to be used as a model. He thought it was a little harder than expected to stand in a position for five minutes at a stretch. He wouldn't be as motivated to go out of his way to pose for anyone else, but if asked by a friend, male or female, he'd be willing to help out. He did two different standing up poses of five minutes each, and one laying pose for ten minutes. What I noticed is that while drawing, I didn't really perceive of him as himself, or even really a person. I was just looking at a series of lines, dark and light parts, and relative positions and angles. I wasn't so much objectifying him as abstracting him. Possibly this is because I have never done any figure drawing before, so I haven't developed the knack of seeing the details at the same time as seeing the whole picture.