I would say usually one on one time together is a no go. The only time I would see that as acceptable is if a long time friend was visiting the area where you lived AND time constraints prevented your partner from joining you in meeting them while they were in town.
Although there is a grey area: what if someone went on a day trip with two people of the opposite sex? When you're doing some activity with two people you can't really have an intimate experience with one of them.
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