I don’t know of anyone else who shares my point of view, and especially not professional sexologists.

You may need to update your beliefs based on that evidence. Admittedly, your personal history has a strong effect on your recommendations for society, but (and I'm sorry that there's no delicate way to say this) your case is not the average.

sexual relationships starting at an appropriate age

You keep using that term, like it's analogous to the essential time window in childhood for language acquisition, but adults are much more flexible.

male business leaders who lack sexual experience need help in acquiring it as part of their training so that they can earn the respect of women in the work place

One anecdote is not evidence, but I'm the least sexually experienced and the most professionally respected person at my office. Even outside of my own team, our commercial department is full of women and all of them defer to my opinion on expected timeframes and quality checks. And I achieve all that while being on principle opposed to the idea that women naturally look up to men for guidance.

this psychotherapist says that young women need the emotional growth that comes from experience with sexual relationships

I think it's time for each individual to decide what they need instead of imposing a homogeneous standard on everyone.