Now i know this sounds odd, by DH says (i realise this is very convenient!) that a lady at his work is doing IVF and her FS told her it is always good to do the deed with 24 hours of egg transfer... this helps the lining of the uterus etc develop naturally and i think the antibodies in the sperm do something good for you to? as soon as i heard this i had visions of my poor little embie being flushed away? i have never heard of this but wondered if maybe that was just me? i am afraid to stand after transfer in case it falls let alone BD....