Philipp Marx
Founder of RattleStork
Philipp Marx is a founder of RattleStork and a former international sperm donor. He writes from first-hand experience about sperm donation, co-parenting, and alternative paths to parenthood.
Before founding RattleStork, Philipp donated sperm in several countries. That experience showed him how differently people approach donor conception, trust, personal boundaries, and co-parenting.
At RattleStork, he combines that perspective with publicly available sources and practical guidance for donors, recipients, and prospective co-parents. His personal experience is not a substitute for medical or legal advice.
Articles by this author
Total published articles:220
How hard can an erection get? Erection hardness explained clearly
The honest answer is this: there is no single universal maximum number that can describe erection hardness for everyone.
Sperm donation in the U.S.: process, costs, and laws
A start-to-finish guide to donor routes, screening, state parentage law, real-world costs, clinic questions, and long-term planning.