How best to go about fucking against a door
First you have to pick your partner, baby. ;) And, of course, your door. It's best to get one with a really NICE handle, especially one of those with a hard round knob. You start off by smearing lube over the handle (if you're tight) and stripping yourself and your partner completely naked. Then they shove you against the door and onto the handle. Even if it doesnt get swallowed up by your arse now it soon will! ;) Then proceed to fuck them BLIND! Soon you'll be getting fucked by both the door AND your partner. It's also great for oral sex because the harder your partner pushes the more anal stimulation you'll get. ;) It makes a lovely slapping sound too when you get slammed against it.
Tips: 
-You can use a stool if you're not high enough
-Make sure you lube it up if it's not working
-Experiment and stick dildos on the door so you get different stimulation every time.
-If you're alone you can even get your pet to lick you out as you thrust yourself against the handle. It's hot, baby. ;)
Warnings:
-If you get stuck the best way to get unstuck is to get even hornier. 
-Don't try this if you're expecting visitors who you dont want to see you naked
-If you have glass in your door make sure you don't get seen by anyone you don't want to see you.
Personal experience:
I tried this with my step brother Derek who LOVED it. ;) He has an MCR poster on his door so he could stare at that whilst seeing me slamming into him. He also recommended wallpapering your room with posters you love so that they secure. I love sticking flesh coloured dildos on the crotches of the people in the posters and fucking them to my hearts content. Fuck this, I've got myself horny again.

Please ask for more sex tips or give scenarios for porn stories. I'll write about ANYTHING, baby.