Interesting thread- I too have wondered about this.

I am in a TTW at the moment and have been avoiding DTD since we last did it 3 days prior to O. I have never actually heard anything about risks involved with DTD in the TWW... but I was thinking that, as the sperm is supposed to 'ripen' the cervix, perhaps its best to wait another week or so.....
It may sound silly but I just don't wanna take any chances in the early days!!!