fellow DMs listen to me.

if one or more of your players roll to seduce: own it. It’s world building. It’s character building. Sex ain’t a free action. Bring that fucker to the bedroom. Think about your NPC’s sexual traits. Roll dexterity. Make your players roll constitution saves. Give them challenges. If they don’t please the beast, go praying mantis on them. What’s weaker than a bard? A naked bard. Their AC has now been hella dropped. Maybe they succeed and all is well, but that displacer beast is clingy and keeps encountering the party.

So the next time some smug players seduces your encounter, you smirk and you turn the tables on them. :)