I'm not exactly trying to compare, I was actually genuinely curious since finance was (is -ish) a roadblock for men to get married, similarly to virginity for women. The best comparison to that question is literally that and I think women have just as much of a right to enquire about it as men do. If a woman ever asked me that question I'd give her the truth straight to her face, whether she likes the answer or not is entirely up to her. If you're genuinely planning to share your life with someone I think there are very few questions that are not acceptable to ask.
As for the finance hindering your life with him, not necessarily. What if he makes just about enough to get by and care for himself? It shouldn't hinder your life with him. Technically all you need know is that he can take care of himself financially. I'm definitely oversimplifying it but you don't lose anything by marrying him.