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
Sex positions with names: the best-known variants explained clearly
Names like Missionary position, Doggy Style, Cowgirl, or Wiener Auster come up all the time, but it is often not clear what they actually mean.
Vasectomy: procedure, how it works, risks, and follow-up
A vasectomy is a small surgical procedure for permanent birth control.
HIV: What you should know about transmission, symptoms, testing, and treatment
This guide explains HIV clearly and without alarm: what the virus is, how it spreads, which symptoms can appear, how tests should be interpreted, and why modern treatment changes so much.
HIV in Everyday Life: What Really Matters After a Diagnosis in the US
This article is for people living with HIV after diagnosis in the US and looks at what really matters in daily life, relationships, work, travel, and self-image.
Male contraception: condoms, vasectomy and hormonal options compared
For now, male contraception is mostly condoms or vasectomy.
Endometriosis and Fertility: When It Affects Conception and What Helps
Endometriosis can make conception harder, but it does not automatically mean infertility.Understanding the AMH level: what does it really say about fertility and trying to get pregnant?
AMH is a useful part of understanding egg reserve and planning when you are trying to get pregnant.
Checking Fallopian Tube Patency: HSG, HyCoSy, what happens, pain, and what the test can tell you
When pregnancy is not happening, checking the fallopian tubes is often a sensible next step.The Two-Week Wait: Symptoms, Progesterone, Test Timing, and What Not to Read Into
The two-week wait is the stretch between ovulation and the point when a pregnancy test actually makes sense.
Letrozole when trying to conceive: how it works, how it is taken, side effects, and when it is used
Letrozole is often used in fertility care when ovulation does not happen regularly or needs a targeted push.Clomiphene or Letrozole: What Is the Difference in Cycle Treatment and Ovulation Induction?
Clomiphene and letrozole are both used when a cycle needs support or ovulation needs to be triggered on purpose.
Embryo Transfer During IVF and ICSI: Procedure, Timing, Aftercare, and Realistic Expectations
Embryo transfer is the last visible step in IVF or ICSI treatment, but the part that really matters is preparation, timing, and the calmer period afterward.Embryonic development days 1 to 5: what morula and blastocyst really mean
The first five days after fertilization often sound like lab shorthand in fertility treatment.
Trying to Conceive After a Miscarriage: When You Can Start Again and What Makes Medical Sense
After a miscarriage, wanting another pregnancy can bring hope, pressure, and uncertainty at the same time.
What people never say out loud when looking for a sperm donor, but mean
People often talk about profiles, values, and tests when they search for a sperm donor.What happens if the donor later wants more contact than agreed?
Contact wishes do not always stay the way they were discussed at the start.
When the family is not on board: how to explain alternative family planning
Not every alternative family plan is understood straight away by the people around you.Why modern family planning often feels more like project management than romance
Modern family planning is often not just about feeling, but also about timing, agreements, documents, and a lot of small decisions.
Why are testicles so sensitive? Causes, warning signs, and what helps now
Testicles often react more strongly to touch, pressure, and pulling than many people expect because their position, nerve supply, and free suspension make them especially sensitive.
Vulva and vagina: the difference explained simply
Vulva and vagina are often mixed up in everyday language, even though they are not the same thing.
How sperm changes with age, stress, and lifestyle
Sperm is not a fixed number.
Is phimosis serious? When it is normal, when you should act, and what actually helps in U.S. healthcare
Phimosis is not automatically a problem.