No, of course it's not influencing sex and relationships in a bad way, on the contrary.

It's very good that societies(at least western ones) are going more and more in the direction of turning sex and sexuality in something that isn't shameful to talk about, that isn't taboo or wrong. Especially when it comes to women and their sexual desires and needs.

It's also very good that there's more ways to have a relationship, that you can much more easily end a relationship/marriage that isn't working without great social consequences and that generally relationships are no longer something that is expected to last a lifetime, or something you have to have in order to experience sexual pleasure and desire.

I think it's also better that you're not basically socially "free" to date more people and try more relationships before you settle down, if you ever settle down that is. It's great that most people, men and women but especially women, now are completely in charge of this aspect of their lives and get to make their own choices.

Also, in my mind gender equality and the empowerment of women can only help relationships, quality wise. Yes, it means men have to do more work emotionally and let go of some ingrained sexist beliefs that they might not even realise they had, but that's a good thing too because it's good to be emotionally aware, to feel and embrace that you're a person with feelings and sensibility just like every human being. Connection is at the core of what makes everything so meaningful and satisfying physically and mentally when it comes to relationships and sex. It's about connection, belonging, acceptance, vulnerability and intimacy, which two people can only have at optimal levels if they are both emotionally open and aware and deeply respect one another. That is way more likely to happen when there's gender equality and in the absence of toxic masculinity and other gender norms and stereotypes.

Some men might feel like it's influencing them negatively because with women's increased agency, empowerment and independence comes a better understanding of their own sexuality and needs and less shame about it, so their expectations also become greater and more nuanced and men don't get to get away with the things they used to get away with in the past.

Marriage losing its importance is good too in my opinion and same goes for a broader acceptance of "kinks" and stuff like that, as long as they are, ofc, consensual and don't harm anyone.
Then, if we move into other things, like lgbtq+ rights and acceptance, again it's all good.