Attraction can occur for any number of reasons, though you'll likely see it most often when Sims learn new skills.
When there is attraction between two Sims, each gets a buff if they're in the same room together.
Practically speaking, this means Becki can immediately call Hunter up and start chatting the night away.
Nothing is guaranteed; he won't immediately come rusing over even if she invites him over, since their relationship score is still 0.
Not willing to go out and actually talk to other life forms outside of her job, Becki decides to set up a dating profile for the Internet.
This is a new feature beginning with The Sims 3 Seasons and is free for all adult Sims.
She also sets her body type to "Slim," reasoning that she's just a Sim Bot and there's not an ounce of body fat on her!
you know, just a harmless revisionist history for her body and mind.
A new feature of The Sims 3 is attraction, which is available with the latest patch regardless of whether you have Seasons installed.
It's a small mechanic, but it can give your single Sims a romantic target in case you have no other plans.
The picture is fixed, but the traits can be altered if you so desire.
Becki gets rid of her Hydrophobic trait in favor of Good, and trades Party Animal in favor of Flirty.
Becki isn't that cynical with life (at least not yet), so she clicks the "Send Message! We don't get to select what precisely the message says, but it's a way for Hunter to know that Becki is interested in him. Pyro, meanwhile, divorces Asewuk and kicks her and their Alien baby out of the Towers because they "fulfilled their purpose." Becki doesn't know what that meant but hopes she doesn't end up like those two, so she goes to the computer and selects the "Check Messages" interaction (from the "Online Dating..." category). Sometimes it doesn't take any effort; we can see here that Tom and Odin both contacted Becki without her making the first move.