Dueling squad: Who do the boys ask for advice when it comes to sex and kissing and all that stuff? As you said Kaiba would need some time before he gets touchy with Franzi so maybe there is someone who gives him a push? Like "And? Have you already slept with her? WHAT THE HECK? NO? What are you waiting for? Or else she's gone!" or whatever. Mokie might be too young? And Yami Bakura is just so ... I feel like he already knows everything so does he even need advice?
So Seto keeps a lot to himself, while he’s ‘friends’ in a sense with Yugi’s gang, he wouldn’t feel comfortable going to them with this type of stuff, especially about sexual stuff. So he didn’t really get advice from anyone, he will use the internet sometimes to get information on how to do certain sex things, but it’s embarrassing ya know.
And as you stated, Mokuba is way too young. Seto feels comfortable talking about certain aspects of his relationship with Mokuba, they are really close despite the age gap, but that’s the line he will not cross. Mokuba probably prods about their relationship, he want this to work and sometimes he needs to guide Seto. Mokie probably was like “what do you mean you haven’t had your first kiss??? Bro, you gotta let her know you love and cherish her?” “Aren’t me words enough?” “????? BRO TELL ME YOU ARE JOKING”. If anyone was giving Seto advice for his relationship, it’s Mokie who is wanting his brother to be happy but also just wildly confused at how he doesn’t know this stuff.
Bakura has a lot of experience, did you see thief king Bakura he fucks. So he doesn’t need a lot of advice. In certain aspects, like more emotional and romance aspects he may need guidance and he either talks to Marik about it or he forces Ryou to help him.
He doesn’t understand why I’m angry or upset over something? Being passive aggressive isn’t working what the heckie?????? Time to call Marik up or force Ryou to talk to him cuz mortals are strange and he doesn’t understand. It’s weird stuff he doesn’t understand, so he does go to people to talk, but it’s always kind of weird.
“Host, why isn’t she responding to my messages??”
“idk, maybe you shouldn’t have been so rude about her cooking.”
“What? She was going to ruin it, how does she not know that??”
“She was cooking it fine, you just only eat super undercooked steak.”
“There’s no problem with that, she’s wrong.”
“She didn’t want you to get sick, how the fuck is she wrong for caring about you???????”