I don't know, either way it's a pain in the arse eh?
I found out today (because I asked!) that DH has basically always done frequent release. I'm glad I know! So now, as well as making sure he doesn't go any more than 24 hrs between releases (and I'm letting him worry about this - less stress for me) we're going to DTD the morning after I get my +OPK, having released at bedtime the night before. So, one attempt on O day. I guess this might be too much in terms of lowering sperm count, but maybe not if frequent release is the normal for him!!