A true friend would well respect your interests as long as it poses no harm to the others.
Yeah that's the thing though... I know intelligent productive helpful people who would want anyone they caught playing something that looked like pic 2 or 3 to publically register as a molester or something...
Everyone I know knows about my love for Im@s. I post about it every day on FB, at least once for whatever reason. I also like to play it on the 60 inch TV in the living room, so my family has seen it plenty of times. 
I'm pretty sure my friends, family, and colleagues don't care.
Holy crap... you must be a girl right? If not... where the heck do you live!? o.0
Believe me,
as a girl there are games that are worse to walk into.
Various eroge...
iDOLM@STER is pretty tame.
My ******** can't be this perverted.
For legal reasons, have to lock my room when conducting certain bits of work. As in "It becomes a federal offense to walk into the room" sort of lockdown. Getting government work does that from time.
You work for the government? o.o *imagines James Bond settling down to a game of IM@S after blowing up a military base.
I'm also the only person I know where it's not uncommon for people to wait outside in the lounge room for me to pack up before I will let them in, or in some cases, outside.
...pack... up? o.o Is that like hiding figurines and posters...? Or stashing away that alien body from Area 51 before allowing guests into the room?
Then again, most people who know me well know that im@s is just a video hobby, and that I work with much more stomach churning stuff, and probably don't WANT to ever walk in...
Stomach-churning stuff....? o.o Are you an FBI serial killer profiler...? A coordinator for targetting human trafficking operations...? An intelligence agent monitoring MS-13 or a drug cartel?
Anyways uh my dad called me a pedophile once when he saw the box for my Chihaya F-15E. They never saw me play iM@S yet though.
lol does your dad not like you now or something? You mean he saw something like this?

It helps that I have an interest in military planes and guns, and that everyone knows that I play a lot of video games.
Aha! Your saving grace when the culture censors come online for evaluation!
In fact, my family doesn't really care about my liking to Japanese pop culture in general.
It seems like a lot of forumers here like the jet aircraft version of the girls? Is that like a reverse Strike Witches/Sky Girls thing or something? I thought moe girls come from objects, do girl characters get assigned to objects too now?