Can we be commanded to love? Most of us would say no. We'd say that love can only be voluntary. Jesus says yes.And with that he sat down. He might have qualified the point a whole lot but he chose not to because the basic point is that we are commanded to love.
And I think that applies in a special way when you are married. Sexual love is a crucial part of marriage. It's one of the things we vow to do when we get married. I could qualify that and there are important qualifications to make, some of which have been discussed in previous posts but the basic point is that we are commanded to do it as a consequence of our marriage vows.