Is my sentence correct?

Use a dash instead of the comma.

Slang alert: This sentence has a double double-entendre.

deadratSlang alert: This sentence has a double double-entendre.

I don't think this would occur to most native speakers. I think that perhaps your double-entendre antannae are a little too sensitive.

It's actually worse than I said. There are three double entendres. Feel free to apply the comparative to me and not the sentence.

If may be that in this sentence about a tiger, most native speakers would remain pure of mind. I wish merely to warn of the existence of the slang, which, of course, I'm far too decorous to explain here. That's what the internet is for.

It was like riding a tiger, you don't know how to get off without being eaten.

That sentence is perfectly acceptable to most native speakers. I see no point in making learners worry about double entendres that would occur mainly to smutty-minded pubescent boys, who can find a double entendre in almost anything.

Most inadvertent double entendres are acceptable, and the context of the adage makes this sentence one of those.

I'm not suggesting that anybody spend time worrying about them. It's just wise to be aware of the pitfalls of slang. I'm sure there are pubescent boys who snickered at say, the title of the Franz Kafka story, but the the examples here are by no means that kind of a stretch.