The best sex hack out there for males. This one is actually real.

Everyone knows these cheap advertisements of pills that make you last longer, give you a greater penis or stuff like that.
Here is an actual working technique to last longer in bed(as a male):
While having sex or semi-shortly before cumming relax your butthole and the muscles around it. Sounds strange? You think you haven't tensed the muscles on your butt while having sex? Well you have even while masturbating or just getting a boner, but you don't realize it. People have spend decades for training their PC muscles, to cut off the semen from coming out while having sex. In reality it's way easier if you just know how.
By just fully relaxing your butthole muscles you will stop beeing close to cum. If you keep them relaxed it will be nearly impossible to cum or even to keep a boner.
If you don't believe me, go to your favorite porn and jerk off and try this technique. You can thank me afterwards.
Beware: It needs a little bit of practice to perform this one during sex, and some people will stop having an erection while having sex when they try it, so be prepared! Also i'm not 100% sure if this works for everyone, but it worked for everyone i have talked about it.