The missionaries can't baptize people who aren't living the law of chastity. So they pretty much have to find out the investigator's lifestyle.
I feel like I should clarify here that I don't think it's strange that they have requirements of people prior to baptism, including requirements that they live according to how the religion wants them to live (you would think if they were going to get baptized they would be at least striving towards living that anyway), but that they would begin to apply them
so early on in the person's investigation strikes me as very strange.
The Coptic people love to have visitors, but they know the Church can appear very demanding from the outside (with its fasts, its long liturgies, its daily prayers, etc.), so usually they will refrain from any such personal talk with you (outside of how you came to find out about the Church, of course, since it's not very well-known in the west) unless you make a habit of continuously showing up. Granted, in my case I made it clear beforehand that I had been doing a lot of studying so I already knew I was interested in it before I was able to actually come to a liturgy (I left the Roman Catholic Church around July of 2009, but wasn't able to go to my first Coptic liturgy until September of 2011 or so), and could read and speak the languages we used other than English (to whatever degree I can!), so I think they might've looked at me a little bit differently. But I saw up close how gentle they were with the Jordanian brother and sister who came to us for several months in a row...some even asked our priest if he would just commune them anyway, even though they were Catholics and hence not a part of our communion (the answer was no, of course), just because they loved them that much. But in the end the Jordanians moved on without baptism, hopefully enriched by the time we spent together. And then there was the time when a random white guy showed up who nobody had ever seen (he had apparently converted to the Coptic Orthodox faith several decades ago, but was passing through the area and had no idea there was a church in New Mexico), and everyone immediately started looking at me and whispering "Do you know this guy?", "Hey, who's your friend?", etc. Ahhhh, yes...I am the
White People Whisperer! Like Cesar Milan, but...you know...not.
The point is, under no circumstances would it be considered appropriate for anyone from church to start asking someone who is just starting out in investigating the faith about their personal living situation, their sexual history, or any of this stuff. Those are things that God-willing are dealt with in consultation with your priest, after the baptism which has washed away the old man/woman so that you are a new creation in Christ. Perhaps this is an idea that Mormonism is missing due to its dedication to not really having clergy? (I know they say they have a non-paid clergy, but it seems more honest an accurate to say that they have a group of volunteers who are given the 'priesthood' because it is something given to boys at a certain age as more or less a rite of passage, regardless of their actual level of theological acumen or even interest in being 'priests'.)
I don't know...I have a feeling that if instead of having the traditional "Come and see" attitude that all Orthodox people have (where you learn what we are about by first-hand experience, by coming to some of our services and seeing what and how we pray), the Coptic people had begun grilling me on my sexual sins or other types of sins or other aspects of my personal life, then whether or not I was found to be 'up to code' would be very irrelevant, because I would've never come back for a second visit.
So maybe there is something in these converts where they must respond well to that. Otherwise, I don't how they could ever win over anyone (since I don't entertain the Mormon explanation that it's the Holy Spirit, obviously). Although now that I think about it, my ex-LDS ex-stepmother was very attracted to it at the time by the picture of happiness that the carpenter who introduced her to the religion painted when talking about his family, so there are obviously many different ways by which a person may get in to the religion. (No surprise that this was during a period of great unhappiness in her marriage to my father. Probably the Mormon idea of "happy families living forever together in heaven" or whatever is a very strong motivation for many.)