As a guy, I can only comment on the male end of it, if I press the issue for myself, I'll need about 20 minutes in between sessions to have something comparable to the first session in regards to erection quality and ejaculation. The latter, I can't make any guarantees on sperm count, but she'll get something none the less.

PS-GorgeousJane, if I must say so, for a headshot, I'd say you're a hottie in a gnd (girl next door) kind of way. Yorkshire, Eng, too far to go though, so it's more like gap (girl across the pond) rather than gnd. Awesome hair, but what's most striking from your avatar, at the base of your neck, the clavicle bones are very strikingly noticeable, excellent jaw structure too.