[b-e-p]

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

[mkramlich]

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.

[hugh3]

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

[kenj0418]

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