<human>: As the title stated, my boyfriend's friend has asked my boyfriend for nudes of me 10-15 times, and has suggested that we "trade threesomes" with him and his girlfriend (one night me, my boyfriend and his friends girlfriend and the other night me, my boyfriend's friend and his girlfriend). This was brought up a few months ago and my boyfriend is very against the idea, so I respected that and we left it alone. Apparently his friend continually asks him for pictures, and a threesome and my boyfriend has told me that he rejects these ideas each time. He has another friend that has also asked him to have a threesome with us (MMF) this time, and he rejected the idea again. I am friendly but not flirtatious with any of his friends, and I am definitely conscious to dress conservatively around them. It's strange because often my boyfriend seems frustrated with me for these requests from his friends, but I genuinely don't feel like I have invited any of these advances. 

I was wondering if this was normal behaviour among friends. My boyfriend and I have been together for 4 years now, and I am aware that sometimes guys swap nudes of their girlfriends in less serious relationships, but this seems strange. Is this just something that guys ask their friends for? Thanks so much for your advice!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Two of my boyfriend's friends have asked for a threesome, and one has asked for pictures of me 10-15 times. Is this normal behaviour for guys?