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, what to expect, risks, and aftercare
A vasectomy is a small surgical procedure for permanent contraception.
HIV: What you should know about transmission, symptoms, testing, and treatment
This guide explains HIV clearly and without panic: 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 UK
This article is for people living with HIV after diagnosis in the UK and looks at what really matters in daily life, relationships, work, travel, and self-image.
Male contraception: condoms, vasectomy and hormonal options side by side
For now, male contraception is mostly condoms or vasectomy.
Endometriosis and Fertility: When It Affects Conception and What Helps Next
Endometriosis can make conception harder, but it does not always lead to infertility.Understanding the AMH level: what does it really say about fertility and trying to conceive?
AMH is a useful clue when you want to understand ovarian reserve and plan fertility care.
Checking fallopian tube patency: HSG, HyCoSy, the process, discomfort and what the test can tell you
When pregnancy is taking longer than expected, checking the fallopian tubes is often a sensible next step.The Two-Week Wait: Symptoms, Progesterone, Test Timing and What Not to Overinterpret
The two-week wait is the stretch between ovulation and the point when a pregnancy test is actually worth trusting.
Letrozole when trying to conceive: what it does, how treatment usually runs, side effects, and when it is used
Letrozole is often used in fertility care when ovulation is irregular or needs a targeted push.Clomifene or Letrozole: What Is the Difference in Cycle Treatment and Ovulation Induction?
Clomifene and letrozole are both used when a cycle needs support or ovulation needs to be triggered on purpose.
Embryo Transfer During IVF and ICSI: What Happens, Timing, What to Do Afterwards, 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 afterwards.Embryonic development day 1 to day 5: what morula and blastocyst actually mean
The first five days after fertilisation can sound very technical in fertility treatment.
Trying for a Baby After a Miscarriage: When You Can Start Again and What Makes Medical Sense
After a miscarriage, the wish for another pregnancy can bring hope, pressure, and uncertainty all at once.
What people rarely say out loud when looking for a sperm donor, but mean
People often talk about profiles, values, and tests when they look for a sperm donor.What happens if the donor later wants more contact than agreed?
Contact wishes do not always stay exactly as they were discussed at the start.
When family members are not on board: how to explain alternative family planning
Not every alternative family plan is understood at once by the people around you.Why family planning today often feels more like project management than romance
Modern family planning is often not just about feeling, but also about timing, agreements, documents, and many 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 clearly
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 quality is not fixed.
Is phimosis serious? When it can be normal, when you should see a GP, and what helps
Phimosis is not automatically a problem.