Once your child is 18 years of age or older and if he/she desires to meet me (the sperm donor), I am willing to meet once. Of course, I may not be able to travel for the meeting, so the meeting must be arranged at my convenience. This is spelled out precisely in paragraph 6 of the legal contract you will sign before receiving the sperm.
If you desire, the "known donor" paragraph may be deleted from the contract. Simply cross the paragraph off from the contract before returning it.