Gents,
What you're all missing here is Traveller's true attitude towards sexual content.
Traveller is not puritanical regarding sex.
Traveller is neutral regarding sex.
When you think about it, you will understand that being neutral is the wise move. When you're neutral, you say neither yes or no. When you're neutral, GM's can very easily add whatever they wish in whatever amounts they wish. When you're neutral, GM's aren't stuck removing what they don't want. Being neutral on the subject is the smart play.
You complain that there isn't enough references to sex, sexual situations, or other adult themes in your Traveller sessions and campaigns? Well, that lack is your fault because you failed to add those aspects to you game.
Traveller's published materials are deliberately designed to appeal to as many people as possible. In that they resemble cafeteria food or tofu. It's then up to you to "spice" the material to better meet the palettes of you and your players. There is nothing in Traveller that states "No additional spices allowed", in fact Traveller continually suggests that it's players embellish or season the published materials as they see fit.
Truth be told, I never heard of these complaints until joining Traveller internet discussions over a decade ago. My adventures and campaigns always contained sex, sexual situations, or other adult themes and I never once thought Traveller somehow forbid it. I had PCs/NPCs who frequented brothels, PCs/NPCs who used escorts, PCs/NPCs who kept different families on different worlds, NPCs who were sex workers, and just about everything else discussed here.
And no one batted an eyelash.
In the Troubleshooters campaign I've wrote about, one of the group's best information sources on Grote was an escort and in one session they helped frighten off someone stalking her. In the Active Duty IISS campaign, the players routinely spent their shore leave at a brothel just outside the base on Conway.
My groups and I handled also the topic somewhat differently from many of the groups and GMs I've sat in with at cons and in FLGS. First, we never role-played sex around the table just as we never role-played doing the laundry. Second, I never used sex as a routine way to entrap the players.
Too many GMs too often start a brawl whenever their players visit a bar, so their players stop visiting bars. Ditto brothels, ditto restaurants, ditto tattoo parlors, and ditto everything else. Normal activities, and sex is a normal activity, should have only normal possibilities for violence. They shouldn't be used as cliched traps for the players.
Too many GMs also too often threaten the in-game families and loved ones of their players. Sure, it's a quick way to get the players involved but, once they see family and loved ones as nothing but a handle for the GM, they'll stop having family and loved ones in the game.
Sex, sexual situations, or other adult themes can be part of any Traveller session. Just how much they should be a part is entirely up to you and you players however, because Traveller is wisely neutral on the subject.
If you want it included, include it. There's nothing in the rules that says you can't.
Regards,
Bill