Right, you folks need to take this off the Web and into the house.
Since you asked, however, there is nothing wrong with either party having friends of the opposite sex. It is even reasonable in many relationships where there is trust and plenty of experience of each other that those outings would not always include the other. Spouse and I have both gone out after work with a group of fellow employees solo.
One-on-one regular outings with someone or more than one someone of the opposite sex does not seem feasible.
If the friendship predates the relationship and that was the practice, what usually happens is the new girlfriend or guy friend meets the friend and gets comfortable with them and they go on or the new girlfriend or guy friend gets bad vibes, and they stop, or the couple’s new relationship founders on this rock and ends.