Like put it in after DTD to keep things "up there"?
If so I'm not sure how this would work. Apparently it's a big race and I read recently tilting your pelvis makes no difference as the ones that will make it will make it regardless and the ones that don't you wouldn't want.
But I also just recently found out that loads of sperm reach the egg, all try to work their way in then one pushy bastard shoves the others out of the way to steal first place. So maybe having more of a group effort is good. Either way, watching with interest and good luck.
I've read that the ones that are going to make it are through the cervix a few minutes after sex. The stuff that falls out is just semen and the 90%+ that would fail the morphology test and never make it to the egg. So there is not much point keeping it in.
I don't think it makes much difference to conception for the reasons mentioned, but I can tell you from personal experience that it does make an enormous difference to the amount of times I am woken up in the night going "ewwww" and not having any wet patches. Especially when using stuff like Preseed or Conceive Plus where there's even more juice floating around. Total TMI I know!!
thanks ladies! ive been using it mainly because i like to get up straight after a good shag and have a tinkle and a stretch before bed and like murder says theres nothing worse than waking up with man juice soiling ur sheets!!