My apologies to anyone who was offended, that phrase is part of Texas vernacular going back at least several decades (and I suspect more like hundreds of years). Perhaps it doesn't extend to other areas of the country. It was meant to be a joke based on the fact that 2S's W was requesting a booty call.
Having sex in these sitches is always tricky business 2S, but in DR MWD says that if you can do it without causing yourself any anguish that it's not necessarily a bad thing. She mentions that sex creates a bond that's not like anything else in the R, so sometimes keeping the bond going can help the sitch. She does say that if it gives you a lot of heartache then it's OK not to do it though. So it's really up to you.
