Stuck? Skip it.
Write the parts that you've got the ideas for and leave the rest with something like this _____ or [kiss scene] (personally I'm a fan of the latter), and fill in the blanks later.
Losing your momentum for the idea you've got is far worse than putting a place holder in the spot you don't have an idea for, and often times I've found the right words for these place holders while writing what happens after it.
