Could immediate jump+dump sway blue?
if done straight away?
this study http://humrep.oxfordjournals.org/con...3/611.full.pdf says:
"However, a recent study (Pyrsak, 1994) is consistent with earlier studies (Ericsson et al., 1973; Rohde et al., 1973; Broer et al., 1976; Beernink et al., 1993; Ericsson, 1994) which find that some Y spermatozoa migrate more readily through a variety of media, including cervical mucus, and it answers the criticisms of Ericsson’s work. Pyrsak (1994) reports that, from a population comprising 50% Y spermatozoa, Y spermatozoa make up 66–71% of the first 10% of the spermatozoa which swim through an albumin gradient. When more than 10% of the original population passes through the filter, the Y/X ratio approaches that of the original population. The studies which failed to replicate Ericsson’s results recovered more than the first 10% and their failure to find Y selection was therefore to be expected."
which, to me, says that if you jump+dump soon after BD and only 10% of the swimmers have made it through into the cervix, there is a bigger chance of conceiving a boy as a result because more Y-swimmers will be in that first 10%.... unless I've completely misinterpreted the meaning of that!
