Hmmm. I remember seeing this on the news a while ago. The orgasm/trust hormone.
Exactly how much of a calming effect does it produce? Glass of wine relaxed, sleepy relaxed? Is it really that noticable? I hate giving oral presentations or having to meet with certain clients, so anything that can calm you down sounds good to me. Last one I tried was Kava Kava root a few years ago and it did absolutely nothing.
But I don't have a girlfriend so I don't know if this whole increased libido thing is such a good idea.