Shanna Moakler's boyfriend is having second thoughts about proposing ... because he's not liking what he's seeing from her and Lamar Odom on the "Celebrity Big Brother" live feed. In one clip, Shanna says to Lamar ... "These are wetter so just keep pushing" ... and he replies "that's always better." The exchange continues with Shanna saying, "Always better when it's wetter, that's my motto."