Bob,
You have an interesting point. I do not consider a behind the scenes as a solo. I do think it is odd to have them back to back. I agree with Tampa that the subject of when to do behind the scenes could be a mixed bag. Joey is somewhat on the right side about being done after another scene is released. But I would like to take this one step further. First, lets look at last years solos.
From Jan. 2014 throught the end of October there were 17 solos shot. I used the end of October as the cut off date since there may be follow-up scenes in the works. So what did I discover?
Of the 17 Solos scenes we have the following breakdown:
1 - Did only a solo.
1 - Did solo and 3 BTS (no sex scenes).
4 - Did solo and 1 other scene.
So about 1/3rd of the models did 2 or fewer scenes. Would it make sense to film a behind the scenes before the model has shown he is willing to stay? It takes time and money to do the BTS. Why shoot it early before we know if the model has staying power? If not, why bother. Based on this I think the Behinds the Scenes needs to be done when a model shows staying power and high member comments/ratings.
For your information the 6 models above were: Kael Diggs (solo & 3 BTS), Dyaln Sharp, Adam Stripz, Salem Pierce & James Riley (1 solo and 1 other scene), and Cooper Douglas (solo).
Now on the positive side 6 of those I'd rate as Regulars (Vadium, Dakota, Tyler, Ronan, Ryan Field & Brody). Regular meaning they have done multiple scenes and/or may be back. Again this is about 1/3 of the new class. One Model when in a different direction (Dimitri). The balance did a few scenes (maybe one weeks worth of filming or max. 2 weeks). Those include Jason Ryder, Jaden Bentley, Jake Tipton, Sebastian Wilde.
So based on this, if I were to decide when it makes sense when to film a BTS with a model, I'd vote for when a model has completed at least two weeks of filming at the Studio and his rating is in the 4.0+ range.
Live Long and Prosper,
Vicekid