depends, do you mean knives? or swords? Personally, knives would be a turn off for me, it kinda sends a message that the guy likes violence, which means he could potentially be dangerous.For that reason, i don't think any mother would really approve of her daughter's boyfriend collecting knives. But, well you know those samurai swords??? I think those are kinda cool, my cousin and uncle have some, they're just for display. It depends on the quantity of your knives/swords too.