This
The Journal of Sexual Medicine research recruited straight men from five countries and compared their median ejaculation time (penetration to ejaculation).
Turks can’t even last 4 minutes. That’s way shorter than other four countries. Netherlands (5.1 minutes), United Kingdom (7.6 minutes), Spain (5.8 minutes), Turkey (3.7 minutes), and the United States (7.0 minutes).
Apparently the study also shows circumcised men last longer, if they exclude Turkish men. Because all Turkish participants are circumcised and it didn’t help them.
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For context:
They recruited 70 to 130 couples from each country.
These couples had a stable heterosexual relationship for at least 6 months, with regular sexual intercourse.
They were instructed to record the time of vaginal intromission until the start of intravaginal ejaculation.
They recorded 7 to 10 sessions over a 4 week period with each couple.
The same person remained responsible to time every session with a stopwatch.