If you regard it as unsolicited information, you seem to put a judgement on it yourself. Perhaps more than the people who would just like to know. Not a requirement but it would also no be unusual in a relationship.
By unsolicited information, I mean it is normal to be open and comfortable speaking about your past sex life regardless if you partner asked to know about it. But specifically be curious and intrusive about your partner's past is different.
Bottom line: this kind of information might come naturally without someone having to ask for it and in that context it is totally fine.
Sorry english is not my native language so maybe I am not making it clear enough.
