Obviously, any sexual act outside of marriage is a result of lust. I think you are missing my point. The verse you cited was about lust, not the actiully physical acts.
Hopefully it's part of most all sexual acts inside marriage as well ;^)
Lust is obviously a central part of it, but I loved a couple of women that I had sex with outside of marriage, and I’m sure they loved me. Young people in our complex society with all its opportunities often, but not always, grow apart.