A good friend of mine came to me with a concern. He has a casual partner he sees for a whole weekend about once a month. She desires lots of sex, but he found himself fairly drained physically to give her as much as she likes, and also physically tired to enjoy some active adventures she likes to go on in between the sex.
I recommended the basic practice of continuing to have regular sex throughout the weekend, but only ejaculating at the end of the time with her, or at most just before going to sleep.
He was quite surprised as generally speaking ejaculation is the grand finale of sex, so it felt like the sex would be destination-less and he wouldn’t know when he should stop then.
I suggested to shift his perspective to the idea that sex is not meant to have grand finales and is ultimately about mutually building erotic intimacy, and is best when it is a flowing and waxing and waning for long extended periods of time, perhaps with a break if you feel physically tired, but even a slowing down, or a change to a different physical act, is even better. Prolonged sexual sessions that are meandering adventures of 2-3 hours long is really the ultimate, and even then, by keeping his “life force” he will maintain physical stamina for other activities and in addition be naturally more attentive, affectionate and drawn to her in the sexual offtime.
He followed my advice, and reported that next time they met she came 20 times. Furthermore, he enjoyed the non-bedroom time with her more, and she remarked that he seemed more energetic and attentive.