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Flexible, Comprehensive,

Integrative & Diverse Course Offerings

Our courses are ongoing and run consecutively for increased flexibility. We work with you to develop a training schedule that best fits your interests and goals as a sexuality professional.

An Unrivaled Learning

Platform for Optimal Learning

Our easy-to-navigate learning platform gives you access to all:

  • Archived workshops

  • Speaker videos

  • Handouts

  • Certificate of completion

All instructors are selected by Dr. Tammy Nelson to ensure the highest level of expertise in delivering cutting-edge content. We are committed to educating and guiding those new to the field and experienced clinicians to meet the challenges of sex and couples therapy.

Expert and Experienced

Clinician Instructors

Online & In-Person Courses

Our synchronous and asynchronous learning options offer great flexibility for busy professionals. Our team at ISTI works with you to:

  • Ensure you meet all education and supervision requirements for certification.

  • Provide you with the necessary documentation.

  • Guide you through the application process.

Image by Aaron Burden
At the Integrative Sex Therapy Institute, our mission is to curate cutting-edge education courses and certification for licensed counselors, coaches, and healing professionals. We recognize and work toward improving compassionate and healing care for those seeking sex and couples therapy. We constantly update our curriculum to maintain diversity and inclusion for all people.

Our Mission

Flexible Payment Options

We offer several flexible payment options for professionals and students to help you on your journey to Certification!


Certified Sex and Couples Therapist (CSCT)

The highly renowned and respected Certified Sex and Couples Therapy (CSCT) 109-hour curriculum meets the ever-evolving needs of clinicians to provide therapy successfully to clients struggling with intimate relationships.  Dr. Tammy Nelson developed a highly effective integrative approach that uses cutting-edge techniques. The Integrative Sex Therapy Institute (ISTI) is on the leading edge of modern psychotherapy with our brand-new coursework leading to the Certified Sex & Couples Therapist certification.

The Integrative Sex Therapy Institute is a globally recognized institution that offers a comprehensive, highly valued training program in sex and relationship therapy. Professionals from all corners of the world seek out this coursework and Certification to be the best they can be as Sex and Couples Therapists.


The CSCT Certification will give you:

  • Cutting-edge knowledge and skills in Sex Therapy and Sexuality counseling

  • Mastery of well-established and respected Couples Therapy interventions

  • Practical techniques to integrate these practices to improve client outcomes

  • Alternative treatment approaches

  • Integrative methods and regularly updated content to reflect current trends in human sexuality and couples therapy


Dr. Tammy Nelson, a leading figure in the field, personally curates the content of this training, ensuring that it is at the forefront of modern psychotherapy. She also involves expert professional trainers to provide a diverse and enriching experience. ISTI also certifies clinicians to become Certified Integrative Sex and Couples Counselors (CISCC). 


Transform your career and your clients' lives with the CSCT Certification. Gain the expertise and confidence you've been seeking by signing up today! 

Certification requires 109 hours of advanced training. You must be licensed to be eligible for U.S. certification. International option available.


Tammy Nelson, PhD is a sex and relationship expert, an international speaker, an author and a licensed psychotherapist with over thirty-five years of experience working with individuals and couples.  In private practice, she focuses on helping people of all ages, orientations and genders, find love, healing and passion. Dr. Nelson is the Founder and Executive Director of the Integrative Sex Therapy Institute (ISTI). She teaches at several Universities, is a TEDx speaker and is hosts The Trouble with Sex podcast.



The Integrative Sex Therapy Institute (ISTI) offers comprehensive programs for professional psychotherapists. 

Earn your Certified Sex and Couples Therapist (CSCT) designation while becoming an AASECT Certified Sex Therapist (CST). Our live in-person classes and eLearn modules provide convenience and flexibility.


With ISTI, you can access a complete yearly schedule of individual classes. Our programs are specially designed by Dr. Tammy Nelson, an internationally recognized expert, author, and thought leader. Learn from respected industry names and discover your best self as a practitioner.

About The

Integrative Sex

Therapy Institute (ISTI)

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