This chapter defines sexual aggression as a distinct, evolved form of aggression that emerges when sexuality (fusion, pleasure, care) and aggression (initiative, boundary-setting, force) shift from polar opposites to a figure/ground relationship. Unlike appropriation—which takes from the other regardless of consent, depletes the field, and relies on destructive force—sexual aggression operates by exchange: I produce surplus, attend to what the other needs, and co-create novelty with less risk and greater sustainability. Rooted in the lived body and supported by genital resonance (without requiring genital acts), sexual aggression keeps excitement high while balancing autonomy with closeness; the ever-present risk of losing the other is accepted as part of adult, non-fusional intimacy. It requires a peer relationship—not symmetry of contributions but mutual dignity, where each has something worthy to offer—and depends on recognition and responsibility to identify with one’s force ethically. An illustrative vignette shows how dialogue that begins as deconstruction (dental aggression) can become erotic exchange when both parties offer and receive stimulation that generates something new. In this mode, violence, appropriation, and total fusion are excluded: they would negate exchange, care, individuation, and confrontation among peers. Sexual aggression is thus one possible form of human contact-seeking—neither synonymous with contact nor reducible to sexuality—through which pleasure, desire, and creativity sustain action without sacrificing the other.