I would, and have, and it caused no issues that I was aware of. We were all in college, I dated M first, then broke up with him and started dating his best friend, J, and then broke up with him and started dating M again.
After we broke up (the second time), J & I were fbuddies for a while. The whole time, J & M were good friends - I think they lived together for a while, and erryting.
I'm still friends with both of them
and invited both of them to my wedding.
Neither of them made it, though.
Now, their female friends
hated me while we were in college. *shrug* I think for me at least, the difference is that I was friends with both of them before I started dating M - so, it wasn't uncomfortable to be spending time in both of their presence while I was dating one or the other.