Is sex about love or lust ?

alright here's the thing . for two months now i've had this same argument with my boyfriend. he thinks sex is about lust and i think it's about love . He's also told me that he's had sex with me because he knew he could get in my pants and because he wanted to . How many of you would feel like they were used or whores or something if you had sex with someone because they want to and think they can get in your pants whenever they feel like it ? Because i sure as hell feel like the biggest whore around