b,
He is right
Anyone may feel more inclined to have sex with someone she/he loves.
Women usuallly are no inclined to have sex with a man she does not "love".
Actually she/he may think he is in "love" with someone, in reality it only means she/he feels good interacting with the "someone.
Love is much deeper than that and may not be related to the opposite sex.
A person may love anyone, same gender or not.
when I am hungry i may me be inclined to eat only at a certain restaurant. Because of the service, enviroment, quality etc. In realitly the food at some other restaurant may be even better. It is a feeling, emotional.
BTW
Eating habits are mostly cultural. You eat what you eat not by a logical rational decision.
TRUE love is logical and rational, emotion may and should be involved.
Problem is defining LOVE. Can you?