- 4-men.org
- Amazing penis facts
- Ask Alice - genital wonderings
- Genital problems in men - selfdiagnosis
- Hilde vd Ploet
- Kamagra oral jelly
- Linkotheek.nl/penis
- Malehealth.co.uk
- Penis friendly sites
- Penis health
- The penis & male sexuality website
- The penis website
- Thepenisbook.com
- Tijdschriftvoorseksuologie.nl