What percent of guys never have a girlfriend?

I'm curious to know, what is the estimated percentage of men who have never had a girlfriend? Is this statistic something that varies widely across different cultures and societies, or is it a more universal phenomenon? Are there any particular factors that contribute to this statistic, such as personal preferences, lifestyle choices, or societal pressures? Understanding this data could provide valuable insights into the dynamics of romantic relationships and the experiences of men who may be navigating the dating world.