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sustain!
So when I was an LDS missionary my mission pushed the Lock Your Heart article on the missionaries quite strongly. With good reason, I guess... In short, I don't believe that it's authentic any more. Here's why.

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What the Elder could get punished for, up to dismissal from missionary service is flirting and dating. The exact wording of the White Handbook, at least when I served was "flirting and dating is not tolerated". Jesus when he's teaching the nephites (3 nephi 11:40) says 'that those who teach more or less than what he teaches come of evil. The White Handbook does not require any less than, sexual purity, and complete abstinece from flirting and dating. But it doesn't require any more than that either. If someone by extension of the White Handbooks rule forbids marriage. You may know that man is evil because the scriptures say (D&C 49:15-16) "that whosever forbiddeth to marry is not ordained of God". Occasionally some RMs end up in circumstances where it is hard to find someone to marry, and if there is a way to meet and marry someone from their mission. Why not? Its better than trying to live the Gosple as a single. The Lord has forgiven people and allowed them to attend the temple for committing sins a lot more serious than that.
That being said. The scriptures have a lot of things to say about the Heart. Locking them is not one of them(D&C 93:30). However He is in the buisiness of changing the hearts of men(all over the scritures). If a missionary can't pray about his feelings for someone and forget them in a mighty stupor of thought (D&C 8:9) Then something needs more prayer, investigation and probably action.
Of course, we just used our Mesmeric powers that stem from our vampirism, drawing our power from the great Crystal Temple at the edge of the Great Salt Lake.