Hi, I'd like to help you with your question.
It sounds like your friend does have the insight to understand that is drinking is a problem, but he is not motivated to become sober.
You are right, you cannot force him to seek help. But you can try the intervention. There are no legal issues around interventions that I am aware of or have ever heard of. As long as your friend has free choice to leave the intervention if he wishes and no one does him any harm, then you can do an intervention.
To do an intervention, it is a good idea to have a therapist or intervention specialist there to help the communication flow well and keep things focused. Here is a link to help you find an intervention specialist and how to do an intervention:
Confronting your friend is difficult but it may help him break through the last of his denial and understand the effects of his alcohol use. The binge drinking may also be affecting his ability to have a normal sex life. Alcohol is a depressant and that could be affecting him physically.
Another consideration is therapy. Along with his alcohol treatment, it would benefit him to find out why he feels devoid of emotion. A past history of abuse or neglect, a traumatic experience or another incident may be affecting his ability to feel and make him want to block out his emotions with alcohol. People shut off their feelings only if they feel they cannot cope with them. A therapist can evaluate the reasons behind this and give your friend an idea of what is causing this.
Your friend also could use a physical checkup to see if there are physical reason for his sexual issues. If he is willing, he should see his doctor as soon as he can. The doctor may also be able to talk to your friend about his drinking and the effects on his body. This probably won't do much to change his mind about drinking, but in the long run it gives him another reason to stop using.
Here are some books that may help as well:
Getting Them Sober: You Can Help! by Toby Rice Drews
When Enough is Enough: A Comprehensive Guide to Successful Intervention by Candy Finnigan and Sean Finnigan
You can find these on Amazon.com or your local library may have them for you.
I hope this has helped you,