Are you sometimes too tired for sex?
Could it be your bed, rather than your partner(s)?
Well, this may be just what you need! Designed by the Italian firm Sogniflex, the bed (costing about $2400) has straps on it to hang onto when passions run high, and a strategically-placed trench for you to put your knees. Judging from the picture, it looks like it's also easy to wipe clean - Lord knows it can get messy when fluids and lube start flying.
When you get so horny that you're pestering your wife for sex when she's doing something else (like vacuuming the carpets), you need to retire to the bathroom or bedroom and rub out a quick one. Just to take the edge off, mind you.
A woman in Ukraine had that problem, and one thing led to another ... and the Horny Hubby ended up strangled with the vacuum cleaner cord. She says she didn't mean to, of course, and I believe her.
Funny old world we live in, ain't it?