If you are looking for room for amorous activities, look at the Catalina
310 or 350. The forward birth in both of these boats is far more suited for those activities than the rear birth on the C36. Not that it can't be done, but the total height of those rear births under the cockpit
can limit certain activities.
Typically, the transmission
area can be accessed OK to allow you to check coupling alignment, the stuffing box area, etc. Sometimes you have to work blind to check the transmission
fluid, which can suck. If you need to do any serious work, like change the transmission or dampener plate (just finished this project), you are better off removing the bulkhead to get better access. Usually this just takes removing a couple of screws because the bulkhead that is in the way is usually not structurally tabbed in. Just for separation of areas.
On big advantage of Catalinas is they generally have a really active owners group. Here
is the one for the C36.
Good luck and fair winds,