I'm looking for information on what constitutes morality and what role it plays or should play in sexual
relations.
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Contrary to the common belief 'the morality' does not exist. When the word is used without
mentioning the rules on which it is based, then it has little meaning. But often in that case Christian
morality is meant (to make things easy think of the 10 commandments).
The term "morality" is mostly used in two ways:
1. descriptivelyto refer to a code of conduct put forward by a society or,
2. some other group, such as a religion, or
3. accepted by an individual for her own behaviour or
4. normativelyto refer to a code of conduct that, given specified conditions, would be put forward by
all rational persons.
Method 1 likely leads to some form of relativism.
Method 2 results in different kinds of moral theories (rational persons act differently).
I suppose you use the second definition. Though rational persons can act in many ways, there are
similarities. And to make things easy often their chosen partner shares their view on life.
So I think of general notions like:
honesty
mutual respect
self-humour (i.e. being humble)
openness
respecting freedom
You mention sexual relations. These you have in two kinds: 1. the ones for recreation, 2. the ones for
a long time relation and possibly having children. You know best what you search for in the first group
of partners. But probably you mean the second. Often attraction plays some role. Don't deny it, it is
one of the ways that developed in evolution for finding a mating partner.
So find your way of weighing attraction and the notions that you find important and using that mix
you'll find a suitable partner.