Sims 3 dating ex
A Pleasant Conversation does not mean you can expect a Sim to allow you to suddenly kiss them.
As the level of the Conversation rises through Suggestive Encounter, to Amorous and Steamy Exchange, more Socials become available.
You may also consider their appearance, as the game has a genetics system to determine that babies will look like their parents.
Finding a few contacts and seeing how those Sims get along naturally is a good idea if you're going to play them in a family together. As the Sims use Romantic Socials on one another, the relationship meter will rise or fall based on whether that interaction was received favorably or not.
Know that Romance is not restricted to Adults in The Sims 4.
If you give your Sim the Romantic Trait, they are more likely to become Flirty at any given time, based on the generation of a random Moodlet.