If he's worn out, tell him...

"Honey, I know you're tired. Just let me do all the work. And if I can't get you excited -- that's OK. Just lay back and let me *try* -- it'll feel good even if you don't cum."

...I've never had him tell me to stop. And I've never had him not cum.

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Life is too short not to love and be loved....preferably multiple times in one night.

I think men talk to women so they can sleep with them and women sleep with men so they can talk to them. ~ Jay McInerney