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 Smarter Decisions
A multiple pregnancy is not some exotic edge case, but it is also not just a singleton pregnancy with extra babies.
Understanding superfecundation: How fraternal twins can begin in the same cycle
Superfecundation sounds dramatic, but biologically it is mostly about timing 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 to focus on next
An early positive test followed by bleeding or a negative retest can leave you feeling hopeful, confused, and frightened within the same few days.
Antibiotics and pregnancy: 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, pregnancy loss, or harm to the baby.
Are my breasts still growing? What is normal in puberty and when to have it checked
Breast development often begins earlier than expected, can move unevenly, and does not finish at exactly the same time for everyone.
Are my labia normal? What variation, asymmetry, and symptoms can 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 Still Counts as a Myth
If you are hoping to get pregnant, it is normal to wonder whether one sexual position works better than another.
How Long Does Sex Usually Last? Average Timing, Studies, and Why Minutes Are Rarely the Main Answer
A lot of people want to know how long sex usually 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-world 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 Canada, these figures work best as an international comparison point rather than a moral benchmark. 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 have it checked
Vaginal discharge is not automatically a problem.
Do I have a sexually transmitted infection? A calm assessment after sex, a one‑night stand or a condom mishap
After intimacy, many people initially feel uncertain. The body feels different; you suddenly notice every twinge, every bit of moisture, every odour. This is normal.
How do I reach orgasm? What actually helps, what creates pressure, and when support makes sense
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 feel this strong and what really helps
Heartbreak can take over the whole day: the first thought when you wake up, a tight feeling in your chest by afternoon, and overthinking again at night instead of sleep.
Am I pregnant? A calm, realistic look at symptoms, timing and tests
Many people experience "Am I pregnant" not just as a medical question but also as a feeling: I need certainty right now. That's exactly why symptom lists alone work so poorly. They rarely provide clarity and often increase rumination.
Wanting children: yes or no? A grounded guide for making sense of it
For many people, deciding whether to have children is one of the biggest choices they face. Some feel a clear desire, others sit with doubt or a steady back-and-forth. This article helps you sort outside pressure from your own view, put common myths in perspective, and reach a decision that feels grounded in your life.