will this f**k up our marriage?

my partner & I have talked loosely about doing this for years. we’ve even been on adult-only trips and contemplated even soft swapping while on holiday. I think our biggest worry is this fking up our marriage. We both settled down pretty early on and we are in our mid-20s and we just think it would be fun to add some spice to our sexlife.

Anyone out here with a relatable experience and can give some insight?

Thanks xx