First of all do not take this personal, I am trying to react in general on a whole generation and not blaming them as each generation deals with life they get confronted with.
As a generation X person I think that the millennial generation is quite risk averse.
You can see this in many fields, from political correctness going over the top, to risk aversion in music and culture, and even when it comes to building relations of which sex is a part.
I do not know or try to point why this is but it does stand out from what I see around me.
I feel very fortunate to have lived through punk music, squat housing, crazy ass parties and taking risks in my life, it made me stronger minded against what other people think of me and more confident in life.