So a few things.
1) if you are not interested in being friends with some group, ie trans, gay, bi, male, female. Why not say so in your profile.
2) if you select "it's a secret" for your sexuality you will get people contacting you who you might not want to.
3) if you are a guy and post a picture of your cock on here and you don't say you are only interested in females you will get comments from gay and bi guys so don't get offended and start calling people names. You put something out there you are going to get comments. If you can't take it then don't post pictures of your cock.
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I have a cock pic as my profile pic because I got tired of guys thinking I was female because of my user name (nerd points if you know what it means) and hitting on me. I post cock pics because I want to contribute original content and it's all I got. I have gotten comments by bi and gay guys and it doesn't bother me, a complement is a complement, it's not like I am going to do anything, I like women.