I find it interesting that this line of argument is used here, where in every other aspect of life it is rejected. For example if you sign up for a credit card and are then subject to its terms and conditions including having disputes adjudicated via arbitration do we not say that signing up for that credit card is voluntary? We certainly would at FR. That is, unless, someone is advocating that matters of Faith be completely devoid of reason.
Show us in Scripture where God demands celibacy of those He has called into service as ministers of the Gospel.