How'd you know that last part?
I just assumed they were randy. There were hundreds of frogs just sitting on freshly rained on roads. Just sitting and occasionally being run over, once by me. Just sitting and waiting. I assumed it was sex.
Google tells me I am very wrong. It's way outside their mating and migratory seasons, so I guess they were all there waiting for slugs and snails to appear.
And from some familiarity with cane toads, I should not accuse any other amphibians of being randy. Male cane toads will attempt to mate with anything, include long dead roadkill, fish in ponds and mud.