Beyond the cougar and kitten type sessions, something that may be more suitable for filming as opposed to voyeur type sessions is dominating a husband and wife or couple. Seems to be a lack of this in the bdsm scene videos. Petra Hunter has done it and it's reasonably believable that the pair could be a couple.

I get why it may be hard to get a couple who is into it in the first place, let alone being filmed, but I did find it hot to see the wife in a cage watching as her husband got pegged and then ate his own cum off the floor.

I wish there were more films like this.