How can one have without being noticed?

my boyfriend still lives with his mother.. most of the time when im at his house we're in bed under the quilt most of the time naked. but we're both afraid that we might get caught.. being naked is already a risk.. having is a greater risk.... anyone has any idea of how to have without being noticed we lovee missionary but we can't do that at his house as his mother is only a room away.. any help plss???? thx