I've asked about this in a few venues before with no luck.

[jesuswasbatman]

SF novel read in the 80s which was accidentally put in the kids' section of the local library because it had a spaceshippy cover and freaked me out.

The bit I remember had a decadent society that did weird gladiatorial combats. One involved two men with remote-controlled explosive dildoes up their backsides, with the object being to guide the other person's dildo far enough in that it would blow up their abdomen (described in gory detail). I'm always sure someone else would remember that, but nobody seems to.

Comments

[fred_mouse]

A list of their publications is here if that helps. Sadly, none of the ones that I've read from that list strike a chord with your description.