I’m looking for a certified sex therapist in Los Angeles

My partner and I have been following out in a relationship lately, and this is putting me into depression. Our relationship is going from bad to worse, and we have come to a point where our communication has come to a near halt.
We have been married for seven years and do not have a baby yet. We have tried and planned, but efforts haven’t really worked in our favor. Now the situation is falling apart more so because I’m unable to satisfy my partner in bed – I'm struggling with erectile dysfunction.
I have been long thinking of visiting a certified sex therapist in Los Angeles or Beverly Hills area. I have shortlisted a few therapists, but I am not very confident and sure if I should visit one. Will the sex therapist help. Is it a good choice?
I don’t want to part with my wife, I love her, but I understand since we are not a complete family yet, and are growing in difference, I want to make sure it is not because of my incapability in bed.