It depends how you define introduce.

You have been going out with someone a dozen times or so across a couple
months and you know this person is significant.

You have gotten the basic information and checked him out. He knows
where you live.

He comes to your home during the day when your kids are rested and busy
doing something quiet they enjoy. There is a polite children this is
mother's friend, Mr. John Doe. They shake hands and go back to what ever
they are doing and you leave with them with adequate childcare. No
details. No drama. He is not invading their oasis and he does NOT try to
be the new Disneyland Boyfriend bringing treats or toys. Your kids are
NOT for sale.

As they see the relationship grow maybe they join you at a family
restaurant. You expect them to behave and he is not the "baby Daddy for
the evening. Not for MANY evenings together.

If they like him fine but the relationship shou7ld be about you and him
not your kids until he has committed and the ring is on the hand. NO
SLEEPOVERS and the Boyfriend is NOT the babysitter.