Sure. There are some times you just want to lie there.

This guy is making sure that's the case, because he got a doctor's note to excuse him from strenuous sex.

Shaun, a Reddit user from Australia (username mitchiganjfrog), posted in Reddit's Funny Comments:

"I hurt my back at work last week. Then again a few days ago in the bedroom. After a talk with my doctor he gave me this medical certificate."

Shaun says he's a roofer and needed a note from his doctor to get out of doing physical labor. And also, sex.

The "medical certificate" reads:

He WILL BE UNFIT TO CONTINUE his USUAL OCCUPATION or SEXUAL services. Shaun can only take part in sexual activity flat on his back with minimal effort on his part."

According to the note, it's woman on top only until April 23.

No word yet from his partner. Who apparently is so super serious about sexing that Shaun needed a note in the first place??