Games : What is the relevance of sexual relations in The Witcher Enhanced Edition?

I'm new to the Witcher franchise of games. Recently, a discussion about sexual relations catch the attention of the digital game community, regarding sexual content on The Witcher 3. I'm now playing The Witcher (first game) Enhanced Edition and notice that the sexual content exists and is part of the game. My doubt is: What is the relevance of the sexual relations in The Witcher Enhanced Edition? The sexual relations interfere in the gameplay (gives special abilities, itens, money or change the history of the game in some way) ?