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Did you not interpret it as "ideas having sex"? How else could you interpret it?

ideas [while] having sex

because I've heard/seen/thought the same thing many times before, and with similar patterns such as:

thoughts while drinking

problem-solving in the shower

etc.

But to be analogous to "ideas having sex" it'd have to be "thoughts drinking" or "ideas showering".

Ideas are always having sex. And I'm usually the one that has to clean up the whiteboard afterward.