Softening Expletives

Some linganth mailing-list subscribers recently discussed the current use of "that's so gay" in relationship to gender relationships and sexual orientation.
The most recent episode of The Word Nerds mentions the softening of that and other expressions in the context of expletives (including the 'F' word). Not family-friendly but quite interesting in terms of language ideologies.
Expletives (87) at The Word Nerds