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 picked up through a test, bleeding or an ultrasound scan.
Superfetation: Can you become pregnant again during an ongoing pregnancy?
Superfetation means that after a pregnancy has already started, another ovulation, fertilisation, and implantation would happen.
Twins, Triplets, and Multiples: Real Chances, Risks, Care, and Better Choices
A multiple pregnancy is not an exotic outlier, but it is also not simply a singleton pregnancy with extra babies added on.
Understanding superfecundation: How fraternal twins can begin in the same cycle
Superfecundation sounds dramatic, but biologically it is mostly a question of timing within the same menstrual cycle.
PrEP for HIV: effectiveness, how to take it, side effects, testing and cost
PrEP can reduce HIV risk very substantially when the dosing plan, testing and medical follow-up all fit together.
Biochemical pregnancy: early positive test, early bleeding, and what matters next
A positive test followed by bleeding or a negative retest a few days later can be deeply unsettling.
Antibiotics in pregnancy and while trying to conceive: what is actually proven and what remains myth
Many people take an antibiotic while 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, progresses unevenly, and does not finish at the same age 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.
Which Position Helps You Get Pregnant? What Actually Helps and What Remains a Myth
If you are trying to get pregnant, it is understandable to wonder whether one sexual position works better than another.
How Long Does Sex Last? Average Length, Studies, and Why Minutes Are Rarely the Main Answer
Many people want to know how long sex lasts on average.
How often do people have sex? Average, age, relationships and the key figures
Many people want to know how often people really have sex.How many sexual partners does a person have in their lifetime? Real 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, and Great Britain at 4 to 6, which makes the figures especially useful for readers in the UK who want a realistic benchmark rather than internet noise. 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 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 and condom mishaps
Many people initially respond to intimacy with unease. The body feels different; you suddenly notice every twinge, every moisture, every smell. That's 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 so brutal and what really helps
Heartbreak can take over the whole day: the first thought when you wake up, a heavy feeling in your chest by afternoon, and rumination again at night instead of sleep.
Am I pregnant? A calm reality check on symptoms, timing and tests
Many people experience 'Am I pregnant?' not only as a medical question but as a feeling: 'I need certainty now.' That's precisely why symptom lists alone are so unhelpful. They rarely bring clarity and often make people worry more.
Wanting children - yes or no? An honest guide without pressure
For many people, deciding whether to have children is one of the biggest life choices they will ever make. Some feel a clear pull; others sit with doubt or a long back-and-forth. This article helps you separate outside pressure from your own view, put common myths into perspective, and reach a decision that truly fits your life.