The science of breeding.

http://www.natureworldnews.com/articles/125/20120821/protein-in-semen-acts-on-brain-and-triggers-ovulation.htm

So while this study is all about heterosexual mating, it wouldn't suprise me if proteins in semen have a direct biological effect on the neurology of the bottom receiving seed.  I've been told the cum "high" I get from taking loads is entirely "in my head", but I have felt for a while that there is a direct link to the depositing of hot raw semen.  Perhaps one day, science will catch up and do experiments on queer sexuality as well, but until then..

Time for more experimentation and data collection.