The best cock rings are even simpler. They're a piece of leather or soft rope tied into place. You have to be soft to do either, putting first your testicles through the ring, and then your penis, since at that stage your penis should be softer and more flexible than the always- solid testes. Taking it off is the reverse process, but since one of the purposes of a cock ring is to keep you hard, this can be easier said than done. Women may also experience lubrication as a response to this irritation.
Spanish fly is also quite poisonous, and therefore illegal in the United States.
Dosage is very hard to determine, as is quality, and you're just as likely to die from Spanish fly as you are to get laid. I suggest you go look these words up before buying anything with these words on the package. Some people regard lubricants as a must-have item in this age of safer sex and they are an essential ingrediant to successful anal intercourse. The use of a lubricant on the inside of a condom can make the sensations delivered to the penis much stronger. Oils also coat the inside of the vagina and rectum, providing a breeding ground for dangerous bacteria.