Well, a common first time might be a bit fumbling. You're not really sure what you're doing at first. Maybe it happens in the privacy of your bedroom, late at night. You start to explore your body and figure out what feels good. It can be a bit nerve - wracking but also exciting as you discover something new about yourself.
It is completely abnormal. Such behavior is not only unethical but can also lead to a lot of problems in friendships and relationships. If a friend is doing this, it indicates that they have a warped view of sexual boundaries and respect. It can make the person whose girlfriend is in the story feel violated and can also damage the trust within the friendship.
Definitely not. In a healthy relationship, both partners should respect each other's boundaries and privacy. Such an act is a violation of the wife's right to have control over her own body and her personal space while sleeping. It shows a lack of respect for her as an individual and for the relationship as a whole.
Definitely not. This kind of behavior is not only against common sense of propriety but also can cause discomfort and damage to the friendship. Friends should engage in positive, healthy and respectful interactions, like going to the movies, playing sports or having a good chat, rather than this inappropriate behavior.