... at least it would force the priests to have to prove that they are not in fact homosexuals.
Good point. Negative proof is a logical fallacy. A negative really can't be proven. Conversely, a pervert fag can go up to woman and kiss her as a means of displaying that he's "not a homo", but such act would be a charade. Likewise, it cannot be expected of a priest to engage in any sinful act or gesture with a woman in order to prove he's not a pervert fag.
Good old fashion "Gaydar", discernment, honesty and prudential ability of vocation directors is necessary to weed out the pervert fags from the selection process of entering seminaries. The key is to have a Faithful and loyal member of Holy Mother Church as vocational directors who are intrepid in being on guard against trojan horses of the perverted kind...