You say that but then go on to describe how your OH found it " difficult to get his head around" and having an "issue to work through".
This clearly demonstrates why divulging such information is not always the best idea.
What’s the alternative though? Hiding it?
If my OH wanted a partner who’d slept with fewer people before him and that wasn’t me, I would want us both to know that at the start! As if it’s something that he would be bothered by it’d probably come up at some point anyway.
It didn’t cause problems for us, in any way, it didn’t stop us dating and getting together. He recognised his reaction and examined it and realised it was a gut response he didn’t want to be having and thought it through and decided it wasn’t an issue.
If someone would think less of their partner or be very put off them finding out their high number it’s absolutely better to know that at the start surely, so it doesn’t just come up later on when you’re more invested in each other?
I want to know if I’m with a guy whose morality around sex is vastly different from mine. I want to know if I’m with a guy who genuinely thinks there’s something bad or immoral or unacceptable about me for having embraced my sexuality when single and had casual sex. As that’s who I am and I want someone who accepts me for who I am (and I’d be very uncomfortable dating a man who thought less of women for their sexual past as that could suggest some pretty gross misogynistic views).
You’re both assessing whether you like and are compatible with each other at the start. I’m assessing a guy as much as he is me. And if he held misogynistic or immature views, and disclosing our ‘numbers’ brought that out, that’s great to know and I want to know as early as possible before being invested.
As PP have said, context matters. Given I don’t mind if a guy has had zero partners or a hundred it’s just curiousity for me, but fairly neutral info in that neither would put me off or be an issue.