Philipp Marx

Philipp Marx

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:191

People of different ages talking as a symbol of different sexual life histories

How many sexual partners does a person have in their lifetime? Actual figures, country comparisons and context

This article is deliberately about concrete numbers, not vague internet claims. In the data used here, Germany comes out at roughly 3 to 4 lifetime partners at the median, the US at 4 to 5, Great Britain at 4 to 6, and France stands out with noticeably higher averages. For readers in India, these numbers are mainly useful as an international reference point for interpreting typical ranges. On top of that, there are clear figures for the last year, for the upper end of the distribution, and for the reason average and median often tell completely different stories.
Two co-parents reviewing a written parenting plan beside a U.S. map and a calendar

Co-Parenting Across U.S. State Lines: What Changes, What Stays the Same, and How to Keep It Practical

Living in different states does not automatically make co-parenting fail, but it does raise the stakes. Parentage, decision-making, travel, money, and relocation all need clearer rules when a plan has to work across state lines. For readers outside the U.S., this is a useful example of how jurisdiction can shape family-law drafting in practical ways. This guide focuses on the pressure points that usually break a weak agreement and the defaults that make a long-distance plan easier to live with.