I did my fair share of doubles, I still do them occasionally but double/single all have their pros. Being serviced by two mouth same time is a feature, does not significantly increase the FS part of lust, aside from visually, but that is just me. I do think double have their value, else how can you get BBBJ and RJ at the same time, or RJ and toeJ same time, you will never know how good it feels unless you do it. still, doesnt help the FS part~