Love can and should be expressed in many ways, the physical one never to be excluded. Love is the art of merging the distinct and still maintaining the distinction. So, love and sex do go together. It is when sex is mistaken for love that pathology sets in. Sex can be had without love.
Loveless sex is the emotional equivalent of eating.
It can be a gratifying experience. But sex without love is NOT love. To provoke our physiological reactions in isolation is NOT to know and to be known, to love and to be loved. To acquire a sense of self worth and a modicum of self esteem by penetrating or being penetrated, by seducing or by letting go is a poor, illusory substitute for the Real Thing. It is also demeaning.