Fastest way to get into sexy stuff is to take her to the tavern and order alcohol (or water!). If she doesn't get hit on, once she's drunk talk to male tavern guests and they'll eventually want to bed you. If she does get hit on while drinking... then they will also bed you!
Aside from that, attending the kitchen Part time job eventually gets imps to play with you in the minigame(and they grope you in the kitchens at night as well almost anytime), and most dungeons have at least a few scenes (slimes in the waterway, nekomatas and eventually werewolves in the main dungeon, etc)
There's a H-Scene guide on the wiki
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(though I think it's missing a few scenes now...), and a basic first-semester guide
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.