I'm not really an ideal coach in this area since I'm headed in the opposite direction, but I'm pretty conscious of what female mannerisms are like, since I've had to consciously mimic them all my life. As someone posted up above, what reads as "female" varies from setting to setting and region to region, but there are a few general rules.
* Take up the least amount of room that you comfortably can. Don't stand with your legs wide apart, or sit with your knees splayed. Wearing a pencil skirt around the house can give you a sense of how a woman positions her legs, especially while in "polite company." (Whatever that is, lol.) There's more variation in how women carry their arms, but in general, the more self-contained you can keep your gestures, the more feminine you'll read.
* Make "gentle" eye contact. Try looking at an imaginary dot in on the bridge of someone's nose as they talk to you. Staring directly into their eyes is weird. The flirty "look up, look down, look away, look up" thing can be cute, but you don't want to read as if you're flirting with everyone you meet!
* Smile a lot. Smile when you first meet someone and every time they smile. Some women smile every time there's a hint of confrontation or conflict in a conversation, but IMO that's more anxiety than femininity. If someone says, "Smile, pretty lady!" while you're trying to work a jam out of the copier or when your car has broken down, you can kick them with your pointy-toed shoe. That's feminine too.
* Speak with a "musical" intonation. That's not very specific and I almost didn't include it for that reason, but it's an important part of reading as female. You're just going to have to listen to a lot of women speaking and learn it slowly. Having a female practice partner to work with would help a lot, if you have such a person in your life. Try not to revert to the male monotone as the tension in a conversation rises. With many women, the more upset they get, the more pitch variation you'll hear. My mother used to go all over the pitch map with "What in GOD'S name are you DO-ing, CHILD?!"
