Shin'yuu no Furin Aite wa, Otto deshita - Vol. 1 Ch. 1

[EchoGirl]

You've lost me.
All I was saying was that it's not possible for a man to comfortably sleep while having sex nor post such without having to get up and go to the bathroom, thus we will reject an offer when we'd rather sleep.

I meant like since JP ppl tend to take baths before sleeping and such, might as well do the deed in the tub as well and rinse off the mess