What is passionate sex?

desired for physical contact with someone else's body, it is a mechanical activity. Rubbing, touching, caressing, kissing, biting, sucking, and of course intercourse

Explanation:

as fulfillments of a desire for physical contact, are all sexual activities in this sense. Here, a key word is “mechanical” because these activities are essentially ways of mechanically stimulating or arousing oneself. Per se, they are self-regarding. They seek self-gratification—fulfillment of a purely self-interested desire.

In contrast, the language of love-making involves thoughts (and perceptions) that unite rather than separate, divide, or alienate. “Two hearts beating as one” expresses a unifying metaphor, although it is not very sensual; while “I want to feel you all over” can be very erotic but still objectifying. “I want to get lost inside of you” can be both erotic and unifying.