This one would seem to tie together articles from that past two days that seemed to say the exact opposit of one another... it seems that cannabinoids will both inhibit and aid sperm motility depending on the circumstance. Dynamite reading here.
An Excerpt:
SAN FRANCISCO -- A cellular signaling system that responds to THC, the active substance in marijuana, as well as to anandamide, a cannabinoid-like molecule normally produced in the body, may regulate sperm functions required for fertilization in humans, a study headed by scientists from the University at Buffalo has found.As always, follow the link to read the rest...In addition, the findings suggest that men and women who abuse marijuana could jeopardize fertility by overloading this natural cannabinoid signaling system that regulates sperm structure, vigor and fertility...