Informal sperm donation: why fathering a child without a contract can cost you dearly

Informal sperm donation: when fatherhood without sens comes at a high price

A man receives an offer many would call a wet dream: a friend asks him to inseminate her without sensual intercourse, without claiming child support or obligations, simply because she wants to become a mother. The proposal, which is circulating on financial forums, hides a cocktail of legal and financial risks that any sensible man should weigh up before handing over his genetic material.

The donor's main argument is that he will bear no responsibilities. But Spanish law is clear: parenthood cannot be avoided with a handshake. If the mother claims child support in the future, the biological father will face payments of around 300-600 euros per month per child, plus inheritance and succession rights. Without a solid contract exempting him from liability — and even then case law is uncertain — the risk of ending up paying 18 years of child support is real.

The fiction of the free donation

Those who defend the idea claim it is possible to sign a leche donation agreement waiving all claims. However, family law takes precedence over private contracts: courts can declare void any clause attempting to evade parental responsibility if biological paternity is established. The only safe route is to use an anonymous sperm bank unconnected to the personal relationship.

The financial calculation nobody makes

Raising a child costs, according to Spain's INE statistics institute, around 672 euros per month on average until age 18. If the mother changes her mind in the future — or runs into financial difficulties — the donor faces a potential debt of more than 145,000 euros. Add to this the emotional costs: fatherhood is not a blank cheque that can simply be ignored.

The sarracena is a classic one: if it sounds too good to be true, it probably is. Sowing your seed in someone else's field without harvesting any responsibilities is a fantasy that clashes with the law and common sense. Those who want to be fathers should be so with all the consequences. Those who don't should go to a sperm bank and leave their friends in peace.