My friend reckons they film over the course of a day and cut together different sessions*. So, hopefully they washed their dicks before going for another blowjob. Even if you'd had an enema, it would still be gross.
*No idea how he knows, maybe he was trying to make me feel better. It's the images as they come across which are yuck.
After meeting and speaking to Erik Everhard and Pascal aka the bonking Belgium both pornstars, they told me ATM (Ass To Mouth) among other themes is very popular especially in the States with Gonzo companies like Anabolic and it really is ATM, thats the whole point and reason it sells, the buying public want to see these things genuinely happen without fakery. With Gonzo they cut a scene and if its Ass To Mouth it gets included in an ATM themed dvd so the dvd may have 5 scenes with each scene being filmed on different days.
Nowadays with Viagra the need for a lot of faking, splicing and manipulation is less, the guys that cant get wood and cum when required simply dont get the work, there are enough reliable guys that can, and these guys like John Strong and Lexington Steele are in constant demand. Erik Everhard told me porn in the states is a constant battle to up the ante, Double Penetration, Triple Penetration, ladies swallowing as many loads of cum as possible, Cum Farting and so on. He also said a very popular item on a porn set is Pineapple Juice, it makes cum taste better apparently with asparagus being one of the worst things to consume.