Dear infomike,

Well, it's the same thing that can make an unknown amateur into an acting star overnight - I guess it's called a lucky confluence of natural aptitude, genes, emotional affect, personal history, and circumstances. Add to that habituation in terms of repetition, and I guess you've got the next Ron Jeremy or Rocco Siffredi or whatever else these guys are named in the here and now. And that includes the "regular" guys who are in these instructional videos.

Forget about the porn - if I asked most regular guys to deliver a bravura performance of, say, Willie Loman's role in "Death of a Salesman" - do you think they could? I bet not. AND they'd have performance anxiety too! As for WHY some guys are better than others at achieving erections in front of the camera - please see the first paragraph.

I wouldn't worry too much about it, unless you plan to change profession....just accept that we all have different talents and some of those involve screwing on cue...kinda like mechanical rabbits...

Ask the Energizer Bunny,
the Love Goddess

It's a bit presumptious to assume that EVERY couple who auditions for these videos actually ends up shooting them.  

The world of Industrial Video, which includes instructional sex tapes, is subject to the same sort of selection process as the entertainment world.  The actors chosen for a role are chosen because they are able to best represent the production company's vision.  There is a selection process. In this case the criteria may not be porn star looks, the ability to take a 12" cock or shoot a load like Peter North but there is a process nonetheless.  Obviously first and foremost would be the ability to perform sexually in front of a full production crew.

Yes, they are "real couples" and the tapes are certainly not porn but the folks acting in these videos didn't just walk in off the street and get the gig.  No production company would take a gamble like that.

The penis may be injected with a drug, via hypodermic needle, that will automatically create a huge boner.  This is a method of treating ED that some doctors prescribe.  The story goes that one of the doctors who discovered this method of treatment delivered a paper on it at a medical conference to a roomful of physicians; he'd injected himself shortly beforehand, and as he delivered the paper for 35 minutes, displayed a big hard-on that he was forced to have because of the relentless effectiveness of the drug.  Maybe it's an urban legend.  But I believe some of the doctors who practice this type of medicine also advertise with "adult how-to videos."