Convex

[Sarah]

Rising or swelling into a spherical or rounded form; regularlyprotuberant or bulging; -- said of a spherical surface or curved linewhen viewed from without, in opposition to concave.Drops of water naturally form themselves into figures with a convexsurface. Whewell.Double convex, convex on both sides; convexo-convex.

[Sarah]

A Guy/Girl Who you used to talk to.

....a conversational ex.

[Justin Bieber]

curved or swelling out:

[Rihanna]

Having an outline or surface curved like the exterior of a circle or sphere.