Sex therapy offers help for people with sexual problems. In the trade it's usually referred to as psychosexual therapy, or PST for short.
It's been around for over 40 years now, so it's not a newfangled trend.
The problems fit into three basic categories: can't get it up, can't get it in, can't be bothered. In fact, therapists tackle pretty much any sexual problem that isn't sorting itself out! It may be a problem you've had for ages or it might be something that's developed after a previously good sex life. You may know exactly what has caused your particular problem - or like many, you may be mystified.
Some sexual problems are purely physical. They could result from disability, illness or a side-effect of medication. Some are purely psychological, originating in negative childhood messages or sexual trauma. Or perhaps the problem stems from relationship difficulties.