It's unfair they're getting abuse from it! Everyone has different kinks. I'm a straight girl and I've experimented with threesomes, all kinds
and I've been seeing guys who got off on seeing his partner with other girls.
Although my boyfriend, I wouldn't enjoy seeing him with another girl at all
it all comes down to personal preference, trust and communication if you do stuff like that in a relationship. Fair play to them, and it seems like it's made them stronger as a couple. I can understand Robbie's desire for it too, he never had the change to "experiment" since coming out as he basically went straight into a relationship