More like shooting myself in the foot as a first time dev the nts and the mystery story in my case dont mix super well imo. Trying my best to make them mesh though.
IMHO it will work if you focus on the main plot and the spicy is something that appens along the ride to lighten the mood. If you focus too much on the sex events it would feel like the protagonists are the first not to take the events seriously, and, i would say, that is not what you want from storytelling. But that considered it doesn't mean that there can't be loads of sex, willing and accidental (see the hobo scene).