Would you submit a paper to your professor without proofreading it first? Would you send in a report to your manager without first giving it a "once over"? No? Well, I have a feeling that the majority of men feel differently about sending a woman a message via a dating site. I'll never understand this.
Listen guys, your first email MAKES OR BREAKS YOU. I can't shout this enough. I don't care what your profile says or how many shirtless pictures you take. If you can't formulate sentences without making a grammatical error in each one, please don't bother to send any. I don't know about you, but I can't just skip over the mistakes. I have to stop and correct them in my head. Call me crazy, nuts, OCD, or extremely picky but it's how I roll. No one is perfect. We're all going to make spelling mistakes or use the incorrect form of 'your' from time to time, but it really shouldn't be in every sentence - especially if you're trying to impress someone.
Bottom Line: If the person you're interested in (male/female) is even moderately attractive, he/she will receive several emails from people just like you. It's in your best interest to put forth some effort to stand out or be lost in a sea of the other sub par emails. Trust me on this.