The only time I DON’T want to have sex is for about 10 minutes after I’ve just had it.
Otherwise…
As others have so clearly articulated though, you’re allowed to feel hungry you’re not allowed to just go and take food.
Provided you enjoy feeling horny for that and don’t expect that any woman should want or allow you to have sex with them just because you want it, that’s fine.
Keep it in your head (and your pants)
It’s acceptable to think you’re entitled to it.
It’s unacceptable to say or act like you think you’re entitled to it. 
If certain women in the office (KW, AP, SB, EN, PG and a few others) knew what I often was picturing while I was professionally talking shop with them, that we were humping furiously up against the walls of the elevator for example, I’d probably get slapped really hard acoss the face.
Every seven seconds, so I understand.
I am so proud that no one yet has used the words “grass” or “field” in their reply.