The odd things is the FCC is not what's keeping really taboo words off the air but they still keep the old guard of psudo taboo words off of prime time.
PS: It's not accurate but many people still think the world started with: "Found/ Under Carnal Knowledge" or "For Unlawful Carnal Knowledge" which comes back to the idea that the word means more than just the act of procreation.
disport
headaches
mistakes
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Alternatively:
pork
mommy & daddy alone time
the beast with two backs
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The possibilities are overwhelming!
Interestingly, I find that some of the more creative "euphemisms" for sex (pork is a middling example) have more shock value when they show up in conversation... the old standards are simply overused, in spite of our best efforts in child rearing, and don't work anymore in conjuring up sufficiently taboo images. Terse, vivid imagery is much more of a live wire.