In my opinion, writing without emoticons comes across as more direct, which is a characteristic of traditional masculinity. I think using emoticons can come across as almost apologetic towards what you've written. For example, if you say something that could be perceived as a little abrasive, and try to lighten it up with a smiley face at the end, it comes across as weak - like you don't have the stomach to stand by your words alone.
Personally I try to be a nice person, and I try to be compassionate, but don't go overly out of my way to adjust the tone of my beliefs or opinions, because they are what they are, and if it's appropriate to share my opinions, then watering them down seems to be both less honest and more likely to encourage emotional weakness at the level of society.
However, in terms of attracting girls, I really don't think it matters that much. Winking or flirtatious emoticons in particular.