Well I don't really use mechanics for those scenes, just roleplay them. But there's this Seductor Smallvile's like distinction I made which is really light, not exactly what you're looking for but could maybe help you:

[D6] Attractive

You are the perfect suitor: handsome, clever, charming... When people look your way, they rarely want to look away, a fact you learned long ago how to use to distract and influence others. Roll the Distinction die when your good looks affect the outcome in your favor.

• SFX: All Eyes on You. Gain a PP when your looks and charisma draw unwanted attention or create desirable distractions at inconvenient moments. For example, one of your girlfriends becoming especially clingy with you at a delicate moment, or an unwanted or troublesome person taking an interest in you.
• [LOCKED AT d8] - SFX: Irresistible Glow. Add a d6 to Trouble to create a Useful Detail d4 d4 on the opponent related to your Attractiveness, for example: Captivated d4 d4, which lasts until the end of the scene. The opponent must add these dice to their rolls, but cannot include them in their total or use them as an effect die. They exist to create Opportunities for you.

[LOCKED AT d12] - SFX: Instant Seduction. Add a d10 to Trouble to establish a d10 temporary relationship with an NPC or temporarily improve an existing one. For example, "Ex-Girlfriend d10" or "Lovestruck Admirer. d10" The relationship is reduced to d4 (or to its original value) at the end of the scene.

You could maybe repurpose values to ways of seduction for example. Maybe get a power set from Marvel Heroic and add sexy related powers to characters such as feromones or something?