Sollux acts totally different throughout the three separate versions of himself.
Duality-themed Sollux is sadistic and masochistic, enjoying blackrom the most. He loves hurting his partner and being hurt right back. But, since this could only really be enjoyable in small bursts of time, he likes it short and sweet.
Blind Sollux is still masochistic, but doesn’t want to hurt his partner. And, as opposed to previously enjoying being cut or scratched, he prefers the pain to be from inside himself. He also laughs and giggles a lot, which kind of throws his partner off.
Half-ghost Sollux prefers more sensual stuff, wanting it to last longer and feel better. He also tends to be more serious about it and wouldn’t laugh like he did when he was blind. Generally, Sollux would focus more on getting the bucket filled than on the sheer pleasure of just doing it.
Two traits that all different versions of Sollux share is that he /always/ comes twice, and he cuddles afterwards, whether it was redrom or blackrom.