I know this is a weird thing to ask but do you think that a Ravenclaw or a Slytherin would invent one day, when attending a wild party, a spell that can prevent pregnancy? My Slytherin best friend has been insisting that it would be her house fellows, not mine, since they are sorta practical and cautious when it comes to this.
I feel like maybe it would be a team effort. The slytherin would probably be the one to realise the issue and want a more practical solution and they’d approach the ravenclaw to work out how to achieve their goal. Ravenclaws tend to be a bit off in their own world so might not have identified the issue, but they’re often creators at heart be that engineering, art, or inventions. The ravenclaw would be the one to come up with proposals for solutions, scrap parchment would litter the floor as various theories were disproven and improved. When the spell is finally perfected, they decide to share the credit. You need both a critical mind and innovation to create something worthwhile