It kind of disgusts me when people just say they "love" their partners because of the sex or how good-looking they are. SOrry to say, but that ain't love. That's lust. And it's really upsetting to me to hear that some people only tell their partners they love them in order to use them for sex. That's toying with their emtions. That can have such SERIOUS consequences. Like you don't even KNOW. It's so painful. They'd feel like they were stabbed in the back when they find out. And yes, I do mean "when". NOT "if".
Anyway, There are several reasons I love my boyfriend.

I'm not sure if I'm IN love with him yet, but...love is a complex emotion. It grows and develops as time passes. So I'm sure that if I'm patient and open about it I'll find that one day I am seriously falling IN love with him. But until then, I'm just as happy to wait.
My boyfriend has lots of great qualities that I admire and respect in him. One thing is that he's extremely open-minded, accepting and respectful of people's differences, no matter how outrageous they may be. He has a strong heart; he's been through a lot of crap, but still manages to smile and enjoy life, even though bad things are happening. He's kind and compassionate towards others. He has a zest for life and an energy that's relaly inspiring sometimes. Haha. He's a child at heart. But most of all, he's honest. That's the most important thing to me. He's honest about how he feels about things, and doesn't hide behind false pretenses. He works hard and has values that he sticks by.
I really look up to him sometimes, because I wish I could be as hard-working and strong-of-heart as he is.

Those qualities makes me feel warm and happy when I think about them in him. I respect and admire as well as love him, for all those reasons stated above.