Imagination, most of the time. Written D/s M/f erotica, or occasionally MF/f, written from either perspective, the rest of the time. I enjoy a lot of the pictures on here but not in a way that inspires masturbation. Just enjoy smut in general, interesting and keeps a slow burn, right?
Never really seek out porn videos.
Best part of any sort of swinging is the 1 on 1 with your own love afterwards. I think that's something who never tried don't understand. It concentrates your pleasure together way more than it dilutes it.