polygamous
Promiscuity
a person who performs more than one task at the same time is usually called multitasker
Both partners will be very happy.
You would call this person a child. By the time a child reaches puberty, he or she knows.
who as had the most sexual partners at one time
Having many different sexual partners (not necessarily at the same time) and not being tied down to one person in a relationship.
no but you'll know when your on a call and another call comes in and you see the same person your talking too coming in as a call, not the person calling you at the time.
Ambidextrous (I think that's how you spell it)
A smart person who doesn't interrupt the singer.
She was never monogamous, she always had multiple partners at the same time.
That depends on what you mean. On the phone that is making the call, and on that person's phone bill, the call will show up at the time in the time zone from which the call was placed. The phone of the person receiving the call, and that person's phone bill (if, for example, you pay for incoming calls on a cellphone), will show the call at the time it was received.
When one person plays chess against many opponents at the same time is called a simul.