From the two scorpio/scorpio couples I know there tends to be closeness but....how to put it....not so much passion. It's more of a sibling relationship, like twins. (yeah yeah, I know, Cersei and Jamie Lannister and GOT). I can see how that could be. I like Cancers but I think the too much sameness could be annoying at times.
agree with moonartist- in my experience (dated a guy born on the same day, just a couple of years older) it cancels everything out- becomes brother & sisterly- rather than anything romantic... or same old-ish...
hmmmm, thoughts?