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
Unnoticed pregnancy loss: understanding biochemical pregnancy, early miscarriage, and missed miscarriage
Unnoticed pregnancy loss refers to very early or low-symptom pregnancy losses that are often first noticed through a test, bleeding, or an ultrasound.
Superfetation: Can you get pregnant again during an ongoing pregnancy?
Superfetation means that after a pregnancy has already started, another ovulation, fertilization, and implantation would happen.
Twins, Triplets, and Multiples: Real Odds, Risks, Care, and Better Decisions
A multiple pregnancy is not some exotic edge case, but it is also not just a regular singleton pregnancy with extra babies.
Understanding superfecundation: How fraternal twins can start in the same cycle
Superfecundation sounds dramatic, but biologically it is mostly a timing issue within the same menstrual cycle.
PrEP for HIV: effectiveness, dosing, side effects, testing, and cost
PrEP can lower HIV risk very substantially when dosing, testing, and medical follow-up fit together.
Biochemical pregnancy: early positive test, early bleeding, and what actually matters now
An early positive pregnancy test followed by bleeding or a negative retest can trigger hope, confusion, and panic all at once.
Antibiotics and pregnancy risk: what is actually proven and what remains myth
Many people take an antibiotic around the time they are trying to conceive or in early pregnancy and immediately worry about implantation problems, miscarriage, or harm to the baby.
Are my breasts still growing? What is normal in puberty and when to get checked
Breast development often starts earlier than expected, happens unevenly, and does not finish at the same time for everyone.
Are my labia normal? What variety, asymmetry and symptoms mean
Labia do not all look the same.
How does masturbation really work? Body knowledge, comfort, and honest answers without shame
For many people, masturbation is a normal part of sexuality, yet very few topics carry this much uncertainty, comparison, and outdated myth.
How does sex work? A clear guide to consent, what to expect, and protection
Sex is a shared process where consent, clear communication, a comfortable pace, and protection from pregnancy and infections matter most.
What Position Helps You Get Pregnant? What Actually Helps and What Stays a Myth
If you want to get pregnant, it makes sense to wonder whether one sex position works better than another.
How Long Does Sex Last? Average Times, Studies, and Why Minutes Are Rarely the Main Answer
A lot of people want to know how long sex lasts on average.
How often do people have sex? Average, age, relationships, and the key numbers
Many people want to know how often people actually have sex.How many sexual partners does a person have in their lifetime? Real numbers, 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, and in the US the figure is closer to 4 to 5, while Great Britain sits at 4 to 6 and France stands out with noticeably higher averages. 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.
Vaginal discharge explained: what is normal, what stands out, and when to get checked
Vaginal discharge is not automatically a problem.
Do I have a sexually transmitted infection? Calm assessment after sex, one-night stands, and unprotected encounters
After intimacy, many people initially feel uncertain. The body can feel different — you may suddenly notice every twinge, every moisture, every smell. That's normal.
How do I reach orgasm? What actually helps, what creates pressure, and when it makes sense to get help
A lot of people look for one trick that will finally make orgasm happen.
Am I gay, lesbian, or bi? Understanding orientation without pressure or rushed labels
The question Am I gay, lesbian, or bi often hits hardest when feelings, fantasies, and closeness no longer fit neatly into your old self-image.
Heartbreak: Why breakup pain can hit so hard and what actually helps
Heartbreak can take over your whole day: the first thought when you wake up, tension in your chest in the afternoon, and overthinking again at night instead of sleep.
Am I pregnant? A calm reality check on symptoms, timing, and tests
For many people, “Am I pregnant?” is not only a medical question but also an emotional one: I need certainty now. That’s exactly why simple symptom lists work so poorly. They rarely provide clarity and often intensify worry.
Wanting children: yes or no? A calm, honest guide
For many people, deciding whether to have children is one of the biggest choices in life. Some feel a clear pull, others live with doubt or a constant back-and-forth. This article helps you separate outside pressure from your own view, put common myths into context, and make a decision that fits your real life.