in California, medical cannabis is legal. the medical issues cover pretty much any kind. a person has to get a Dr. evaluation & certification to be eligible to purchase from any dispensary. also, the certification allows one to be in possession of a minimal amount of medical cannabis if any peace officer finds some in their possession. it's not illegal yet, but you will be busted you are high when driving cuz it's considered under the influence.
growers supplying the dispensaries are licensed & have to follow state requirements. the type of license growers have dictates the quantity they can grow & sell to dispensaries.
one interesting fact about medical cannabis being legal in CA is that it's still a Federal crime. of course, the Feds aren't going to put much effort into busting anyone for this w/ other more serious criminal activities needing their attention. I have never heard in the news or otherwise that anyone has had any trouble w/ the Feds.
my biggest concern about medical cannabis being legal is the competition it creates w/ the huge drug cartels who bring marijuana into our country. too much violence can come of it right here in our own cities. not good, not good at all.
any benefits to sex, nope. from what I hear, medical cannabis leaves one w/ less energy than what's normal for an individual. and the brain is less stimulated too.