H Plus, the transhumanist magazine, ponders it. My favorite answer:
The primary purpose of the Singularity will be seen, after the fact, to be Awesome Sex. There will be exponentially more sex, with exponentially more interfaces, and with exponentially more measures of pleasure … We will be installing bioports into our body, a la The Matrix or Sleep Dealer, each of which can stimulate our nervous system. In heterosex, men penetrate women, but with this, men and women will interpenetrate each other, multiply, and, as with USB 2.0 daisy-chaining, so will men, women, and androids be able to multiply-interpenetrate, locally or remotely. determine how many selves would be involved. The entire field of posthuman sex could give new meaning to sex freedom and gender differentiality — where a person could have different scenarios, depending on what form or type he/she is in.
(Hat tip: Kerry Howley)