This is actually all rather irrelevant.
It's like you're answering the essay question you revised for, instead of the actual question.
Absolutely...for some people sex doesn't involve love etc.
But the question is not; can someone have sex with someone without loving them; of course they can.
The question is "can someone love someone and have sex with someone else" (while in a monogamous relationship with them and without agreeing non monogamy. In those circumstances, it is highly likely that;
a. that would devastate them,
b. It is unacceptable to them,
c they are breaking the "contract" of monogamy & sexual exclusively
d. They wouldn't find the same being done to them acceptable... Because if they did, they'd ask for an open relationship, not cheat.
So the answer is ... No
Neither the infidelity bor the dishonesty is truly compatible with love.
Love means to treat the person's wishes and rights as equal to your own.
Cheating means you haven't treated their rights as equal to your own.