You just can't be a rapper and serve Usher R&B vocals on one album.
They are so scared to be called gay.
It's so bad that male artists are placed in this extremely small box and if they do anything that might transcend those limitations just a little, people will automatically attack their sexuality. It's why the pop world is being ruled by females at the moment, because the public finds them more interesting. Males can only do so much before people start questioning them, and yet the public are bored of the same thing that males are doing right now. It's quite hypocritical of us, and an unfortunate situation that we've created.
It's the same thing for the rap world, Drake is probably the most 'feminine' mainstream rapper that actually has some credibility (with critics, at least), but the hip-hop community won't think twice when calling him soft or 'gay' for his genuine lyrics. I mean, it's horrible.