If you really want to make your midi-chlorians crawl, the scene was actually filmed, and was a hair removed from being added to the movie.
Lucasfilm"Sir, R2's erection sensors detect an anomaly in the area."
But right before they lock lips, C-3PO and R2-D2 burst in, because one of their protocols is cockblocking.
Lucasfilm"I am fluent in over six million forms of buzzkill."
Luke gets pissed off, unaware that the bothersome duo saved him from going full Lannister. Luckily, the moment was cut out of the movie, lest we wind up with yet another Skywalker twins wrestling each other in a mud puddle situation.
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