I say, if you can't love without sex, you shouldn't be sexing that person, hahaha. Ok, that was the immature side of me.
Here is my basic understanding of love: love is autonomous, it stands alone. In this context, you are using Eros which is one of the Greek words for love, and it is generally associated with passion, sensual desire and longing. Now, you will not have any interest in having sex with someone if there is no passion, no sensual desire, and no longing. In conclusion, sex is not possible without love.