Tinker Gnome
Adventurer
I find I have no trouble RPing female NPCs.

Of course, she's hot. Your DM roleplays too much."You see a hot elf chick...uh...do you want to do her?"
Of course, she's hot. Your DM roleplays too much.
Human beings* do not have gender. Gender is a grammatical concept (masculine, feminine, and neuter). Human beings have sex: male or female [/nitpick]
*and demi-humans, etc. etc.
As a scorching pre-op tranny, I'm comfortable portraying any gender.
But I can understand that it can make some people uncomfortable, especially young men.
That is a great suggestion. Another thing I often do is base NPC's off of characters who I have gamed with in other gaming groups or at conventions.Whenever I'm unsure about how to DM a female NPC I ususally think of some movie, tv, or storybook character to base the character off of.