Thank you for your reply, but it was not exactly what I was looking for. I AM trying to be tactful, hence my request for advise. If you could tell me a little more about how men's sexual health, behaviors and desire changes in their 40s, I hope and think I'll be able to understand him more, and take actions in a subtle way.
And our sexlife is currently great, I also mentioned that the communication is good above. But as I've always been with men around my age, I find the three points mentioned in the above question something that differs from my earlier experience. By expanding my knowledge in these areas, I think will make me more confident, understanding and explore the challenges in better ways.
Thanks in advance,