It is with great regret that I inform you of my desire to excuse myself from our lunch conversations. Although I do enjoy your company very much, I am not comfortable with a lot of the subject matter of our conversations. I have participated or remained in the midst of conversations because I have not wanted to be teased about excluding myself. However, I cannot continue to pretend that I am okay with it and, at the risk of being called a prude, I am removing myself from the environment. I hope that you will understand where I am coming from. I do not accept disrespectfulness from anyone else and should not make exceptions.
I am sorry that I am not able to go into details, I do not feel it would be appropriate by this means, but I would be happy to discuss this further with anyone who wishes to do so.
No worries, I am not upset, but I feel that work is stressful enough and lunch is supposed to be a time to relax and be comfortable.
I know this is probably coming out of left field for a few of you, but I really respect you guys and hold you in the best of regards and I do not want that to be compromised.
It was very difficult for me to write this, I have been thinking about it for a long time and just kept trying to convince myself that I was being sensitive and that the conversations were just a means of being silly. But, I was not being honest with myself or with you guys and I cannot continue to do that. I think it would not be fair for you to have to curb your fun on my account, so I believe removing myself would be the best thing to do.
I hope you understand and are not upset by this email.