The point of no return near the vagina or anus. The penis will be attracted to enter either hole, but until it goes beyond that hole's event horizon, sex proper has not yet begun.
However, not going beyond the event horizon does not imply that sex will last longer, as the erotic and sensual forces upon the penis that close to the event horizon can result in premature ejaculation.
Professor: As one approaches the event horizon it becomes harder and harder to keep from entering the black hole.
Student: LOL, harder.
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