(NSFW) How do I last longer?

The other night I had sex with my wife,we have been married almost two years, and then boom. I have heard if I flex my pc muscle that I can last longer, is this true?

Does anyone else have tips that could help? Endurance for me has been an issue, I have had a talented mouth so my wife has never been disappointed.

How long should I be lasting? Maybe I’m normal. I last about two to three minutes when we actually do the deed.