My guess is that even those who say they enjoy casual sex are bright enough not to ever say that they enjoy casual love. Love is a much more encompassing word than sex. Sex suggests a physical connection which "with enough motion" can provide the "release" which pretty well describes its purpose for some. "Bam, bam, thank you, ma'am!" is hardly an expression of love. We speak of masturbation as a form or self love and most of us agree that it is important to love one's self. But, when the goal of sexual intercourse is mere release for even both parties we speak of that as mutual masturbation. That is still a long way from love.
I like this definition of love: "To love is to seek the good of the other for the sake of the other." When two persons approach sex with that attitude, when both parties have the aim of pleasing the other, a wonderful thing happens: both are not just satisfied but affirmed and the bond between them is made stronger. It's a win-win and no one feels used.
Sex does not necessarily lead to love. Love often finds it deepest expression in sex and love can outlast the sex.