Years ago, I used to partake in a number of what would be termed "recreational drugs". To be honest most of those things were better / worse than viagra- personally speaking.
Spliff / herb whatever u call it made me horny and would give me staying power. However I found that E (mdma) was about the most erotic horn enduring substance known to man (to me anyways!).
I suppose they are mood enhancers, if u feel horny they will endure that feeling even more!
Few years since I've had anything stronger than a pint or a spliff. But looking back they are what helped me to become the sex bomb I am today
Hehe