I'm planning on using preseed to help with conceiving, but if I use astroglide liquid water based lube also for other positions other than missionary to make it more comfortable will it have any effect on my boyfriends sperm? Has anyone else heard if astroglide isn't the best to use? I figured i only use the astroglide during certain positions we'll be ok. I just don't want to mess up my chances to concieve. Does anyone recommend any other safe lubes?