there's a similar post out there but i'll add my 2 cents to this one as well.
1. real
2. not saggy
3. proportioned (d cups on a 125lb woman? probably fake anyway)
4. nipples point up, not down (see #2)
5. real
to each his own but i don't need h-cups on a woman for her to be sexy...breasts are only part of a package that includes her ass, eyes, legs, face, and overall shape. everything in proportion works better than two beach balls on a twig.