Janusz Korwin-Mikke, the head of Poland's Congress of the New Right (KNP), also believes women are less clever than men.
Oh, and he also wants to deny them the vote.
In comments calling for the standards of rape to be heightened, he said: "Women usually pretend that they don’t want [sex]. The percentage of women who pretend that they don’t want to have sex, but they do want in fact, is about 30 or 40 per cent
He added in the Observer interview: "Semen probably is not wasted, because nature usually makes use of the material it has, and there is a hypothesis that the attitudes of men are passed to women by way of the semen which penetrates the tissue.
"It is not a political statement. There is a very strong argument for this hypothesis, that now when contraceptives are much more in use, the women become much more independent."
Korwin-Mikke is no stranger to controversy having said in 2007: "Women still should not have the right to vote. Just choose any political meeting at random and see how many women are present."
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10 Policies You Had Forgotten Ukip Had Made
And if that wasn't enough he once claimed Hitler would be acquitted in a modern court of law as he had no idea the Holocaust was actually happening.
Despite this it has not stopped Nigel Farage's party from courting the group in order to save his Europe of Freedom and Direct Democracy (EFDD) group.
They risked collapse after Latvian MEP Iveta Grigule announced she was leaving to sit as an independent.
Groups in the European Parliament are formed to secure positions on committees and speaking time as well as receive funding. They need representatives from at least seven EU states to be recognised.
Farage recruited Polish MEP and KNP member, Robert Jaroslaw Iwaszkiewicz, to make up the numbers.
Iwaszkiewicz defended his leader's comments on Hitler as well as saying making jokes about wife-beating.
When asked about wife-beating by the Wroclaw Gazette in May of this year, Iwaszkiewicz said he was "convinced" that beating would "help bring many wives back down to earth". He added he did not beat his wife as "we always got along" and there were "no problems".
Iwaszkiewicz said that "unfortunately, I never beat my children." Asked why he had said "unfortunately," the Polish politician explained: "Because it would have toughened them up. It would have strengthened their character and they would be able to behave better in crisis situations."
He aslo said the EFDD was "vital and unique" and needed to be helped. "I joined the EFDD Group because of two important values - opposition to EU bureaucracy and support for free markets so firmly supported by the Ukip delegation," he said.
Welcoming him, Farage said: "European Parliament President Schulz's part in trying to shut us down last week was contemptible. It was manipulative backroom politics of the worst kind. But in his eagerness to silence the Eurosceptic voice he acted prematurely.
"EU Federalists will be sitting in a corner somewhere slowly rocking muttering the words 'please make the Eurosceptics go away' over & over. We will now make the EU's centralising fanatics regret their short-lived bout of hubris."
Ukip has previously had to defend its allegiance with other controversy-laden members of the EFDD, including the far-right Sweden Democrat party.