I remember seeing a thread by a guy who was experimenting with chemical PE and was a steroid user, but unfortunately I can not find it.
The consensus among the medical community is that steroids (ways of increasing certain hormones like testosterone) can severely fuck you up in the long term (i.e. flooding your body with so much testosterone that your body stops doing the natural processes that create testosterone so that when you come off the juice your body has even less testosterone than when you started).
If I had to guess I would say that testosterone DOES have an effect on PE, but not in the same way muscle growth from testosterone use is affected. There are natural, healthy ways of increasing testosterone, such as a proper died, lots of exercise, and proper sexual habits (people who masturbate too frequently have very low testosterone levels).
If you plan to experiment with testosterone levels and PE I would recommend doing some research on natural ways to boost testosterone rather than reaching for the syringe.