Yes - the double answering happens sometimes. Can't be helped, if people ask the same question of more than one of the guys. We are guys, in different locations, we don't talk to each other much unless we have to.
If your guy regularly can't stay hard for penetration, and assuming you are a normally charming and sensual female - get him to see a doctor, because there is something wrong with him. Could be low blood pressure, anaemia, stress, excessive smoking, heart disease, or a dozen other things. I am no doctor and can't diagnose some random guy I ain't seen, even if it was ethical.
Now as to how you introduce the topic - that'd be "very, very carefully." Not trying to make fun of you in this case, just being honest. If a guy can't perform, he gets stressed out. If it gets pointed out, he gets more stressed and fails even worse. And guys, despite the whole "man flu" myth, hate like fury to go and see the quack.
You be patient, cautious and persistant, and eventually he'll go.
Sorry I can't help you more. Getting a guy to the doctors is a bit like herding cats. Possible, yes. Explicable, no.
Told you I wasn't teasing ...