Can a sub have more than one Dom?

I saw this question in a Fetlife group and didn't really think a lot about it at the time. But now I'm reading An Owned Life by Dennis Najee which makes me ask "can a sub have more than one Dom"? According to the definition of a D/s relationship that Mr Najee is providing within his book which is "submission is limited in scope" and ceases at the end of the designated activity that it is possible as long as the sub is able to fulfill the needs of the Dom she is serving and lives up to the role as discussed between the parties.

Now, I understand that most Dominates would not like to share. But in the case of LDR (long distance relationships) or even those based solely on-line this would be suitable to all parties. Ok, I've thrown it out there, what's everyone think.

I have sent this question to Dennis Najee to get his opinion also.