Not while on a Mission. Mormons take some things more seriously then others do. It is a different way of looking at the World. It is hard for Non-Mormons to understand that sometimes. Besides that, if the LDS Misssionary thinks he might really like someone, then he can just wait until after the LDS Mission is over, and if they want to be friends with that other person, and that then leads to marriage, then there is nothing wrong with that. But when you are on an LDS Mission, then that is what you need to be focused in on one hundred percent of the time, simple as that. Besides that any kind of monkey business will get an Elder in deep trouble, and they are always with another Missionary, so it is virtually impossible for something untoward happening during a Mission (I have never heard of this happening). LDS Missionaries are true men and they are dedicated servants of Jesus Christ, if that was not so, then they would not be serving an LDS Mission, promoting Jesus Christ and Jesus Christ's holy and righteous commandments, in the first place.