I've read some pretty terrifying things about this aspect.Someone I was seeing, we had this double whammy in synastry. It didn't last long enough for this aspect to play out though.
We both have Mars/Pluto in natal (his trine and mine sextile).
I'm curious to know what this aspect is all about. I read of danger, power struggles, extreme anger, jealousy, possessiveness, the darkest parts of ourselves etc
What else can you tell me about Mars square Pluto on synastry?