There are established mathematical terms which may be construed as to carry sexial or drug/alcohol-related innuendo. Examples:

 1. handlebody
 2. pipe dream
 3. drunkard's walk
 4. perverse sheaf
 5. [Tits alternative](https://en.wikipedia.org/wiki/Tits_alternative)
 6. [hairy ball](https://en.wikipedia.org/wiki/Hairy_ball_theorem) theorem

Should MO start censoring these and similar established terms, too?
IMHO, word play in some of the cited in the question jokes is quite similar, e.g. "Moebius stripper". 

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PS. I do not advocate lewd jokes, I merely want to point out that we are on a slippery slope in this thread.  

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PPS. Deleting several years-old answers is an attempt to rewrite history; I'd rather see these answers commented as "examples of inconsistent application of website policies, disapproved". Or perhaps screened away as "sensitive/offensive content", so that an extra click is needed to see them.

I discussed this question with a female CS professor, and her remark was that MO should not resemble a male sauna in its tone. That is to say, an overload of these sort of jokes might be too much for some to bear.