My boyfriend is pudgy and, to my surprise, I have been very excited to watch him gain weight. He's about 5'11, 210, and I would love to see him get chubbier. But now, he's asked me to gain weight. It's pretty clear the idea excites him. I have always been thin. Is it fair for me to decline his request when I like it so much that he is not thin? I'm a little intrigued by the thought but not really ready yet to act on it.