That's not even a good analogy. Using heroin is entirely different from marriage. I'll tell you from personal experience when I was single and you'd be discussing marriage and problems in marriage with friends and I would make an observation they'd say how can you know anything about it? You're not married, like I how could I understand some of the problems since I had not experienced them. Once I got married, I no longer got that reply. Now you tell me, If you are going to counsel someone on marriage, who do you think someone is more likely to listen to?. Someone who has experienced the same troubles or someone who is on the outside of the institution of marriage. My personal experience says someone who has been married.
* of course it is. The gentleman was claiming one had to experience something before one could counsel another about it.
What about cannibalism? What about necrophilia? The list is quite long; limited only by one's imagnation