It depends on the viewer and executioners ideas, if orgasm (for me only male one makes sense since it is visible, with female probably the fast movement of legs would indicate it), also if and what device and where it enters comes from the ideas which underlies the crucifixion. In my early life I considered it as painful death method, so the nails are the most important thing, the sun (remember we have the wrong ideas about the climate during Christs executions) and so on. I later learned about the idea, that the cross stands for the state and is an abstract male form which "fucks" the crucified to death. If one wants the victim to experience an orgasm one would probably drug the victim, the problem I see, unlike porn star normal males will not show a reasonable dick size or an impressive orgasm, also considering the audience is not very close to the cross.