My advice is go to a website like mangaupdates.com (a very extensive manga database) and use the advanced search feature. Make sure to use Shoujo and possibly Romance. Filter out any thing you don't want, and go! Bishounen (literally beautiful boys) are most common in the Shoujo genre. You can also search the "I'm looking for..." forum for similar requests. Because listing the large amount is much too tiring. But for starters, I say go with mainstream Shoujo manga, like Fruits Basket. Bishounen galore.