As far as I my understanding goes, they both stand for each other. You can't have sex without love (unless ofcourse, both have a different agreement), and you can't have much love without sex. Given a situation, it's hard to justify whether a genuine lover has unconditional love, without any sexual intentions. Everybody at some point, I think expects a sexual relationship from a serious long-term commitment. And, if there happens be a relationship with substantial importance given to sex, the fulfillment of that goal changes their priorties, and eventually the relationship "terms".