You would if you were a bloke
It goes something like:

Ejaculate
Pull out
Turn over
Fart
Fall asleep

Within about 3 minutes. Unless I make a concerted effort to stay awake.
( K2k6 has a proper job these days, Fri 28 May 2010, 14:18, 3 replies, latest was 15 years ago)

You forgot
"Maintain a low level of unconscious flatulence throughout the night, which you'll be told off for the following morning."
(LongJohnBaldry, Fri 28 May 2010, 14:20, Reply)

Very true
I sleepfart quite well, apparently. One of my mates first told me that when we shared a room in a youth hostel.
( K2k6 has a proper job these days, Fri 28 May 2010, 14:22, Reply)

And this ^
It's all hormones and chemicals innit, makes us menfolk very sleepy after blastoff. Please keep that in mind when you suddenly want to talk about what Deborah said to you at work today.
( Labia Majora You keep on talking but it makes no sense at all, Fri 28 May 2010, 14:20, Reply)

I don't suffer from that
I don't sleep well, so even sex doesn't make me sleepy
( Vipros. clever got me this far, then tricky got me in, Fri 28 May 2010, 14:21, Reply)