In essence, Paul is saying that we need to learn to control ourselves.
We are not to take advantage of others – whether it's taking physical liberties or pressing for another type of intimacy.
One way married couples strengthen their relationship is by praying together. But the manner in which they pray should preserve their personal boundaries. For God has not called us for impurity, but in holiness." (See also Colossians 3:5 and Galatians -24).
While this passage primarily applies to physical boundaries, it can also cover other areas of intimacy.
The partner with the stricter boundaries should set the norm for the couple.
All that being said, there are certain physical boundaries that are clearly biblical.
Spiritual: Some well-intentioned Christian couples begin devotionals or prayer times with one another.
These are both great practices, but they also need boundaries.
To an extent, dating couples will become increasingly emotionally intimate. As people begin to know and trust one another, they become more deeply emotionally linked.
It is also wise to be aware of whether certain physical touches lead a person to desire more intimate touch.
For example, does a hug of greeting quickly lead to a make-out session?
Physical: It is difficult to provide solid physical boundaries that apply to every dating relationship.
Depending on one's culture and one's typical physical contact with others, physical boundaries may vary. This is not a sign of intimacy or love so much as it is a greeting. It is also important to look at the degree to which the physical touch is carried out.