Sympathetic nervous system orgasm
Normal male sexual function: emphasis on orgasm and ejaculation
Autonomic Regulation of Sexual Function - Neuroscience - NCBI Bookshelf
Neuroscience. 2nd edition.
The relevant autonomic effects include: (1) the mediation of vascular dilation, rhythmic vaginal contractions during orgasm in females; and (4) contractions of the sacral segments S2–S4 and reaches the target organs via the pelvic nerves.
Description:Female sexual pleasure, rightly understood, is not just about sexuality, or just about pleasure. It serves, also, as a medium of female self-knowledge and hopefulness; female creativity and courage; female focus and initiative; female bliss and transcendence; and as medium of a sensibility that feels very much like freedom. But this information superhighway is really more like a super-labyrinth, the architecture of which differs enormously from one woman to another, and is completely unique for each one. This diversity of wiring in the highly complex female pelvic neural network helps explain why women have wildly different triggers for orgasm. By contrast, the male pelvic neural network is significantly simpler, consisting of comparatively regular neural pathways arranged neatly in a grid that surrounds the penis in a circle of pleasure.