That seems reasonable, though I'm still baffled by how they could possibly not know that everyone can hear them. I mean, whenever anyone has a conversation in this suite, everyone else in their rooms can hear it.
I did a bit of a ninja edit on you so I'm going to repost this to make sure you get it:
Again, they probably have no idea that what they're doing is noisy enough to be heard by people in other rooms. That is exactly what happened to me and my girlfriend. In the heat of the moment you think you are being quiet but really everybody can hear you. We made a conscious and concerted effort to keep it down or play music over it so we wouldn't bother anybody. Nobody said anything about it so we assumed either nobody could hear us or nobody cared if they did. Obviously our efforts were in vain, but we didn't know that. We thought we were being good, considerate housemates.
There are two main reasons why "they could possibly not know that everybody can hear them". One is that it's really easy to get caught up in the heat of the moment. You're turned on. You are focusing on moving past the foreplay and onto the actual act. Then you're focused on the act. Everything else kind of just fades to the background. When you're having sex, generally you aren't thinking about how everything is audible in the house. Especially when you're in your own room that you have to yourself with the door closed. Having that door closed gives you piece of mind, you feel comfortable, closed off from the rest of the house. You can't hear anybody so you assume they can't hear you.
The other side of it, as I noted in the above passage, is that often they do "know they can be heard" at least in a general sense. My girlfriend and I were taking conscious steps to keep the noise down and we thought what we were doing was sufficient. If you talk to your roommates you may find the same thing is the case. You try to keep things quiet, or your girlfriend and you aren't much in the way of "screamers" and you assume there isn't much noise being made. You get caught up in the moment and don't notice the incredible amount of noise you're actually making.
I'd say that avoiding making much noise shows consideration for others, which indicates maturity, while constantly being noisy shows an immature lack of consideration. I haven't done a damned thing, no noise, no complaining, no pranks, no confrontation, nothing but silence, yet a lot of posters here see me as the problem. That touches a nerve.
Nobody is (or at least I'm not) pinning the blame on your for being bothered by sex noises. That is irritating, and from your perspective, it absolutely can be seen as inconsiderate. The thing they are blaming on you is that the recourse you opt for, at least in this thread, is to be passive aggressive. That's the main issue I had a problem with, as someone who has been on the receiving end of passive aggression. It wasn't nice. It hurt, and moreover it made me mad and frustrated. It totally ruined two perfectly warm friendships.
By the way when (or if) you talk to the offending parties I recommend you think about how all of us coming in and accusing you made you feel. It touches a nerve and your first instinct is to get defensive. When talking to people the most important thing is to be calm and clear. Don't get accusatory. The only "fault" they've made, really, is that two people in a relationship are having sex. A simple request from a roommate shouldn't be a problem, and, as I noted earlier, I'm sure you'll be pleasantly surprised to find they had no idea they were causing a problem and are totally open to finding a solution or compromise. If you get too accusatory or ambush them or something like that you'll probably find they'll get defensive and may not be so open to your suggestions.
