As creepy as it is to realize that people write porn with robots having human genitalia, it only leads to an even more troubling question - what happens in the smut where they don't?

Do they scrape their shapeless, boxy lower-torsos against one another and pretend to feel something? Do the boxy lower-torsos transform so they have pseudo-manbits? Does anything really happen besides more screeching metal sounds than your average car accident...? I mean, I never really watched Transformers, but I never got the impression that they had, err... Physical sensations.