Judging from your question, you must be starting out new into
domestic affair.
A word of advice, don't do things that you regret unless there is
no others in the picture. Feeling can be generated and it is hard
to distinguish real or just for fun.
When you are young, we are very affectionate. Every action made by
the other party has it's reaction.
Think through carefully, would you want your BF or GF to reverse
that effect on you?