@sharutiaburaddofouren >scripture uses the euphemism for Joseph having sex with her, and talks about Jesus' siblings trying to prevent His ministry including His mother meaning of course she sinned
I don't believe Mary was sinless, but I also don't see a scriptural basis for this. I don't find it unreasonable that Joseph, who was significantly older than her at their betrothal, might have already had children, nor that they might have abstained from marital relations for other reasons. I also don't see it as a hill to die on and don't find the concept worth much discussion. Salvation is through Christ, not Mary, and discussion of private martial matters is a bit odd to me. People become "autistically serious" about their stance and opinions on this sometimes, which I think is foolish.